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Kymco UXV 450i Service Manual

Mar 20th 2024

Periodic Maintenance Chart


Periodic maintenance is required to keep the vehicle safe and performing properly. For use exceeding the chart repeat the service intervals. This periodic maintenance chapter includes all information necessary to perform recommended inspections and adjustments. These preventive maintenance procedures, if followed, will ensure more reliable vehicle operation and a longer service life.


EVERY
WHICHEVER COMES FIRSTmi
Km
ROUTINEMONTH
Engine oil•Replace (Warm engine before draining).ooo
Oil strainer•Clean.
•Replace if necessary.
ooo
Engine oil filter cartridge•Replaceooo
Front drive gear oil•Check oil level/oil leakage
•Replace every 12 months.
oo
Rear drive gear oil•Check oil level/oil leakage
•Replace every 12 months,
oo
Air filter element (for engine)•Clean. (More often in wet or dusty areas.)
•Replace if necessary.
oo
Air filter element (for V-belt compartment)•Clean. (More often in wet or dusty areas.)
•Replace if necessary.
oo
Engine breather system•Check breather hose for cracks or damage.
•Replace if necessary.
oo
Spark plug•Check condition,
•Adjust gap and clean.
•Replace if necessary.
ooo
Fuel line•Check fuel hose for cracks or damage.
•Replace if necessary.
oo
Valves•Check valve clearance,
•Adjust if necessary.
ooo
Brake•Check operation and brake fluid.
•Replace brake pad if necessary.
ooo
Coolant•Check coolant leakage.
•Replace if necessary.
•Replace coolant every 24 months.
ooo
V-belt•Check operation.
•Replace if damage or excessive wear.
oo
Exhaust system•Check leakage.
•Retighten if necessary.
•Replace gasket if necessary.
oo
Spark arrestor•Cleanoo
Wheels•Check balance/damage/runout.
•Replace if necessary.
ooo
Wheel bearings: Front and Rear•Check bearing assembly for looseness/damage.
•Replace if damaged.
ooo
Steering system•Check operation.
•Replace if damaged.
•Check toe-in.
•Adjust if necessary.
ooo
Drive shaft boots•Check operation.
•Replace if damaged.
oo
Suspension (front)•Check operation.
•Correct if necessary.
oo
Suspension (rear)•Check operation.
•Correct if necessary.
oo
Knuckle shafts/ Steering shaft•Lubricate every 6 months.oo
Fittings and Fasteners•Check all chassis fittings and fasteners.
•Correct if necessary.
ooo

Air Filter Servicing

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Air Filter Removal

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Remove the seat. See the Seat topic for more information.

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The air filter cover has seven clips. Open the air filter cover clips.

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Free the tabs at the front of the cover and lift off the air filter cover.

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Inspect the airbox cover seal and replace it as necessary.

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Loosen the air filter clamp screw with a flat blade screwdriver or an 8 mm socket.

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Lift out the air filter.

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Clean out the airbox.

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Remove the outer air filter element.

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Loosen the air filter holder screw with a #2 Phillips screwdriver. Remove the screw and washers from the air filter.

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Remove the air filter holders from the air filter.

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Slide out the air filter screen. Inspect the air filter for foam deterioration, tears and glue separation. Replace the air filter if any damage is found.

Air Filter Servicing

Service the inner and outer air filter elements in the same manner.

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Place the filter in a container and saturate it with a foam air filter cleaner both inside and out. Products like Simple Green, dish soap, or most non-flammable solvents will work if foam filter cleaner is unavailable. If using foam air filter cleaner be sure to follow the manufacturers instructions. Let the filter soak for approximately 5 minutes or follow the cleaning product instructions if different.

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Rinse the foam filter in warm water until the water runs clear. You may squeeze the filter to remove excess cleaner and water, but do not twist it as this may tear the foam. Repeat this cleaning procedure a second time if needed.

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Pat the filter with a clean towel to remove most of the water.

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Let the filter dry completely, using a fan helps speed the drying process.

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Place the air filter in a plastic bag and pour in the air filter oil, use enough oil to saturate the filter. Use a high quality foam air filter oil. Gently work the oil into the filter.

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Once the oil is worked into the filter remove it from the bag and squeeze out the extra oil, do not twist it as this may tear the foam

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Use more towels if needed to absorb any extra oil, when your finished you should have a nice even coating of oil on your air filter.

Air Filter Installation

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Insert the screen into the inner air filter element. Install the holder halves into each end of the inner air filter and screen.

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Install the air filter holder screw and washers. Tighten the air filter holder screw securely with a #2 Phillips screwdriver.

UXV450i_0027

Install the outer air filter element over the inner element.

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Fit the air filter into the airbox. Tighten the air filter clamp screw securely with a flat blade screwdriver or an 8 mm socket.

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Install the air filter cover. Secure the air filter cover with the clamps.

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Install the Seat.

Air Filter Drain

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Inspect the airbox drain tubes. Remove the tubes and drain away any fluid build up or debris that may have collected.

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Inspect the air intake tube. See the Air Intake Tube topic for more information.

Air Intake Tube

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

When servicing the intake tube do not allow debris to enter the intake tube.

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Remove the hood to access the air intake tube. See the Hood topic for more information.

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The air intake tube filter is located behind the top left corner of the front storage box. Inspect the intake tube for debris or anything restricting air flow.

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Remove the front storage box to gain access to the intake tube filter. See the Front Storage Box topic for more information.

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Remove the two filter cage screws with a #2 Phillips screw driver.

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Remove the filter cage.

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Remove the intake tube filter. Inspect the filter for damage or deterioration and replace as needed. Gently pat the filter or use low pressure compressed air to clean the filter.

UXV450i_0282

Fit the filter into place and install the filter cage.

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Install the cage screws and tighten securely.

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Install the front storage box. See the Front Storage Box topic for more information.

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Install the hood. See the Hood topic for more information.

Brake Fluid

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

This vehicle uses DOT 4 brake fluid. Do not mix the brake fluid types. The system should be bled whenever the brakes feel spongy, or if the brake system has been taken apart and rebuilt. Always use fresh brake fluid from a tightly sealed container.

Warning: Brake fluid is very caustic and can damage paint, chrome and plastic. Wipe up any spills immediately.

Brake Fluid Inspection

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View the master cylinder reservoir.

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Make sure the fluid live is above the minimum mark.

Brake Fluid Draining

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Place a suitable container under the master cylinder to catch the fluid. Remove the brake fluid drain bolt to drain the brake fluid.

Note: Do not splash brake fluid onto any rubber, plastic and coated parts. When working with brake fluid, use shop
towels to cover these parts. The front and rear brakes follow the same procedure.

UXV450i_0453

Loosen the bleeder valve on the brake caliper using an 8 mm wrench. This valve is usually very tight so use a box end wrench or a 6 point socket and ratchet to prevent rounding off the head. Snug the bleeder valve back down. Place a length of 6 mm inside diameter clear hose on the bleeder valve and place the other end in a container to catch the old brake fluid. Loosen the bleeder valve and pump the brake pedal to remove the brake fluid. Stop pumping the pedal when the fluid stops flowing. Alternatively, you can use a Mighty -Vac or a similar device to suck out the old brake fluid.

Brake Fluid Bleeding

When bleeding the brakes, start from the farthest caliper and work towards the master cylinder.

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Fill the master cylinder with DOT 4 brake fluid from a fresh, newly opened container and bleed the brakes.

Note: The front and rear brakes follow the same procedure.

UXV450i_0464

Pull off the rubber cap over the bleeder valve on the caliper you are working on.

UXV450i_0453

Loosen the bleeder valve on the brake caliper using an 8 mm wrench. This valve is usually very tight so use a box end wrench or a 6 point socket and ratchet to prevent rounding off the head. Snug the bleeder valve back down. Place a length of 6 mm inside diameter clear hose on the bleeder valve and place the other end in a container.

Pump the brake pedal several times and hold the pedal down. While holding the pedal, loosen the bleeder valve. The brake pedal will travel all the way to the floor and brake fluid and/or air will come out of the bleeder valve into the 6 mm hose. Tighten the bleeder valve before releasing the brake pedal. Pump the pedal several times again and repeat the process.

Be certain to check the master cylinder reservoir occasionally to make sure the reservoir doesn’t run dry. Add more brake fluid as necessary. Continue this process until clean brake fluid comes out of the bleeder valve and there are no air bubbles. The brake pedal should feel firm.

Tighten the bleeder valves to specification and push their rubber covers over the nipples.

Brake Caliper Bleed Screw: 0.6 kgf-m, 6 N-m, 4 ft-lb

Make sure the reservoir has the proper amount of fluid. Install the master cylinder cap. Check the function of the brakes before operating the machine.

Brake Inspection

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Brake Pad Inspection

UXV450i_0454

Inspect the brake pad linings for wear.

UXV450i_0502

Make sure the wear doesn’t exceed the wear grooves in the linings. Replace the brake pads as a set if needed.

See the Front Brake Caliper or Rear Brake Caliper topic for more information.

Brake Fluid Inspection

UXV450i_0052

Compress the brake pedal several times. The pedal should be firm. If the pedal is not firm, but mushy, the brake system requires bleeding. See the Brake Fluid topic for more information.

Remove the following components:

Place the vehicle on level ground so the master cylinder reservoir is level.

UXV450i_0469

Check the level of brake fluid. Remove the cap and fill the brake fluid with DOT 4 brake fluid to the upper mark if necessary.

See the Brake Fluid topic for more information on brake fluid changing, filling and bleeding.

Parking Brake Inspection

UXV450i_0233

Make sure the parking brake doesn’t drag when the lever is released, and the parking brake holds when the lever is applied.

UXV450i_0456

Adjust the inline cable adjuster as needed.

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Trace the cable up from the parking brake until you reach the adjuster. Loosen the adjuster lock nut with a 10 mm wrench. Turn the adjuster out to decrease free-play and turn it in to increase free-play. Always check that the parking brake operates properly.

Compression Test

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Run the engine to warm it up before conducting a compression test. Make sure your compression gauge is in good working order and does not leak. The battery must be fully charged when testing the compression.

Remove the spark plug. See the Spark Plug topic for more information.

UXV450i_0341

Install the compression tester into the spark plug hole using a compression gauge adapter and tighten it hand tight.

Hold the throttle wide open and use the electric starter to turn the engine over. Crank the engine until the needle on your compression gauge stops rising. This should occur in 4 to 7 seconds of engine cranking. Do not crank the engine for more than 7 seconds. Compare your reading with the specification.

Cylinder Compression Pressure: 170 – 227 psi

High compression is an indication of excessive carbon buildup on the piston or a result of performance modifications.

Low Compression Troubleshooting

  1. Verify the starter cranks the engine over and normal speed ~ 400 rpm
  2. Make sure the compression gauge is working correctly
  3. Make sure the throttle is fully open for testing
  4. Check the valve clearance – Valve Adjustment
  5. Inspect the valves or valve seats – Valves
  6. Pour 29.5 ml (1 fl oz) of fresh engine oil into the spark plug hole and retest the compression. If the compression is now in the correct range the piston and rings should be inspected. – Cylinder and Piston

Coolant

SAFETY FIRST: Antifreeze is highly toxic and can kill pets and animals if drank. Do not leave coolant where animals (including children) can get to it. Protective gloves and eyewear are recommended at this point.

WARNING: Removing the radiator cap while the engine is hot can allow the coolant to spray out, seriously scalding you. Always let the engine and radiator cool down before removing the radiator cap.

Coolant Inspection

UXV450i_0063

Remove the hood. See the Hood topic for more information. Place the vehicle on level ground. Check the coolant level in the coolant reservoir when the engine is cold as the coolant level will vary with engine temperature. The coolant level should be between the maximum and minimum marks. If the level is low, remove the coolant reservoir cap, and then add coolant or distilled water to raise it to the specified level.

UXV450i_0064

Place the machine on the level ground. Check the coolant level in the coolant reservoir when the engine is cold as the coolant level will vary with engine temperature. The coolant level should be between the maximum and minimum marks. If the level is low, remove the coolant reservoir cap, and then add coolant or distilled water to raise it to the specified level.

Coolant Replacement

Draining

  • Perform this operation when the engine is cold.

Remove the following components:

UXV450i_0066

Remove the radiator cap by pushing down and turning it. Remove the radiator cap in two stages. Allow any built up pressure to vent and then open the cap all the way and remove it.

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The drain plug is located on the water pump. Place a drain pan underneath the water pump and remove the drain plug using an 8 mm socket.

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Be prepared for the coolant to spurt out quickly. Use a temporary drain guide to direct the coolant into a suitable container.

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Install the drain plug with a new sealing washer and tighten it securely after the cooling system has been drained.

UXV450i_0288

Remove the two mounting bolts and drain the reservoir tank. Install the tank and tighten the two mounting bolts securely.

Coolant Refilling

Coolant capacity
Radiator and engine: 2.5 liter (2.65 US qt, 2.2 Imp qt)
Reserve tank: 0.3 liter (0.32 US qt, 0.26 Imp qt)
Standard coolant concentration: 1:1 mixture with soft water

UXV450i_0067

Slowly pour the new coolant into the radiator filler neck until it reaches the bottom of the neck.

UXV450i_0064

Fill the reservoir tank to the FULL line. With the reservoir cap and the radiator cap off, start the engine and let it run for several minutes. Blip the throttle and rev the engine a few times. This will purge any air out of the cooling system. Add coolant to the radiator and the reservoir tank as needed.

UXV450i_0065

Install the reservoir cap and the radiator cap and bring the engine up to operating temperature. Check the level of the coolant in the reservoir tank and add coolant if necessary. Do not remove the radiator cap with the engine hot!

Engine Oil

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Engine Oil Inspection

Start the engine and let it warm up for 2 – 3 minutes. Park the vehicle on a level surface. Stop the engine and allow the oil to settle for at least a minute.

Remove the seat. See the Seat topic for more information.

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The dipstick is located on the generator cover.

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Unscrew the dipstick/ filler cap. Remove the dipstick and clean away the oil. Make sure the dipstick O-ring is in good condition. Insert the dipstick and thread it in. Remove the dipstick and inspect the oil level.

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The oil level should be in the textured area of the stick. If the oil level is low add more of the same type and brand of oil to the engine through the dipstick/filler hole. Use a long funnel to reach the hole. If the oil level is significantly above the textured area drain some of oil with the drain plug.

Engine Oil Servicing

Start and run the engine for a minute or two, this will heat the engine and allow the oil to drain out faster and more completely.

NOTE: Hot engine oil can burn you, take precautions not to touch the oil when draining.

UXV450i_0403

Place a drain pan under the oil filter and drain plug.

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Loosen the drain plug with a 19 mm socket.

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Remove the drain plug and sealing washer. Discard the sealing washer.

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Allow the engine oil to drain into the drain pan. Remove the dipstick/filler cap to speed the draining of the oil.

UXV450i_0156filter

Remove the right rear wheel for better access to the oil filter. See the Wheels and Hubs topic for more information.

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Use an oil filter wrench and loosen the oil filter cartridge. Remove the oil filter cartridge.

Special Tool – Oil Filter Wrench: E052

MXU450i_25-drain

Install the oil drain plug with a new sealing washer. Tighten the plug to specification with a 19 mm socket.

Engine Oil Drain Plug: 26.5 Nm, 2.7 kgf-m, 19.5 ft-lb

UXV450i_0407

Apply fresh engine oil to the rubber oil filter seal.

UXV450i_0405

Install the oil filter onto the engine and tighten it securely by hand. Make sure the seal is making good contact with the engine. Torque the filter to specification with a filter wrench.

Oil Filter Torque: 10 Nm, 1.0 kgf-m, 7.2 ft-lb

Engine Oil Strainer Screen

Remove the skid plate. See the Skid Plates topic for more information.

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Remove the four oil strainer cover bolts with an 8 mm socket.

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Remove the oil strainer cover. Inspect the strainer cover O-ring and replace it as needed.

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Remove the two oil filter strainer screen bolts with an 8 mm socket.

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Check the oil strainer screen for metal debris accumulation that could indicated engine damage. Clean the screen with a high flash point solvent and compressed air.

NOTE: Always wear safety glasses when using compressed air and never point it directly at yourself or anyone else.

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Apply fresh engine oil to the strainer screen O-ring.

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Install the strainer screen. Tighten the two strainer bolts securely with an 8 mm socket.

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Install the strainer screen cover. Install the four strainer screen cover bolts and tighten them securely with an 8 mm socket.

Install the skid plate. See the Skid Plates topic for more information.

Oil capacity: 2.85 L
Oil exchanging capacity: 2.2 L
After draining and oil Filter cartridge change: 2.4 L
Engine Oil (Recommended): SAE 5W-30 [motorcycle or ATV specific]

Caution: Any oil used in place of the recommended oil could cause serious engine damage. Do not use oils which contain graphite or molybdenum additives. These oils can adversely affect clutch operation. Also, not recommended are racing, vegetable, non-detergent, and castor-based oils.

UXV450i_0400

Add the proper type and quantity of oil and install the oil filler cap/dipstick. Start the engine and let it run for several minutes. Check for any oil leaks. Check the oil level as describe above. If the oil level is too high drain the excess oil from the oil drain bolt.

Engine Oil Pressure Check

Make sure the engine is up to operating temperature before checking the oil pressure.

1. Connect the tachometer to the engine.

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2. Remove the oil pressure plug. Connect the oil pressure test kit to the oil pressure plug hole.

Some oil seepage may occur when installing the oil pressure gauge. Wipe up oil residue with a cloth.

3. Start the engine and run it at 3000 RPM. The oil pressure gauge must read as specified.

Standard: 16-21 psi
Oil Temperature: 60 °C (140 °F)

If the oil pressure is lower than specified, check for low oil level, defective oil pump, and oil leaks.

Whenever internal engine components wear excessively or break and whenever oil is contaminated, the oil pump should be replaced. The oil pump is not a serviceable component. To replace the oil pump see the Oil Pump topic.

If the oil pressure is higher than specified, check for too heavy engine oil weight, clogged oil passage, clogged oil filter, or improper installation of the oil filter.

Final Drive Gear Oil

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Final Drive Gear Oil Inspection

Place the vehicle on a level surface.

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The front and rear final drive gear housings have an oil level check bolt (B) and a filler cap (A).

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Remove the oil check bolt with an 8 mm socket. It is not necessary to remove the filler cap to check the oil level. The oil level should be even with the check bolt hole so that a little bit runs out when you remove it. If additional oil is needed see the Oil Filling section of this topic.

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Inspect the check bolt O-ring and replace it as needed. Install the check bolt and tighten it securely with an 8 mm socket.

Final Drive Gear Oil Draining

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Remove the filler cap with a 17 mm socket. Inspect the filler cap O-ring and replace it as needed.

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Place a suitable oil drain pan under the drain bolt. Remove the drain bolt with an 8 mm socket.

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Once the oil drains out completely, install the drain plug with a new O-ring and tighten it securely within 8 mm socket.

Final Drive Gear Oil Filling

UXV450i_0573

Fill the final drive with the specified quantity of oil. The oil should reach the height of the check bolt hole.

Recommended Oil: SAE 80-90

Front Final Drive Gear Oil
At disassembly: 270 ccc
At change: 250 cc

Rear Final Drive Gear Oil
At disassembly: 250 cc
At change: 230 cc

UXV450i_0572d-i

Install the oil level check bolt (B) and the filler cap (A). Tighten the oil level check bolt and filler cap securely.

Lubrication

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Check the cable operation. Lubricate or replace if unsmooth operation.

YZ450F_1454

Use a cable lubricator to lubricate all control cables with a quality cable lube.

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Use the grease nipples located on the rear knuckles pivots to lubricate these components with lithium based grease.

Spark Plug

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Spark Plug Removal

UXV450i_0108

Open the cargo bed.

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Pull the spark plug cap off of the spark plug. Clean off the area surrounding with compressed air or a shop towel to make sure debris doesn’t get into the combustion chamber when the spark plug is removed.

NOTE: Always wear safety glasses when using compressed air and never point it directly at yourself or anyone else.

UXV450i_0339

Remove the spark plug using a 5/8 in. deep well spark plug socket.

Spark Plug Inspection

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Inspect the color of the porcelain nose of the spark plug. The color of the spark plug can indicate how the mixture is burning. A white colored plug shows a lean mixture, where a dark plug shows a rich mixture. See the Spark Plug Troubleshooting Chart for more information.

If the plug is dirty or has carbon build up it can be cleaned with small wire brush. Do not hesitate to replace a spark plug if the gap is excessive or if the plug appears burnt or dirty. Always check the gap of the spark plugs before installation. If the gap needs to be adjusted bend the ground electrode carefully.

Spark plug gap: 0.8-0.9 mm
Spark plug: Standard CR6E (NGK)

Spark Plug Installation

Thread the spark plug in by hand to make sure it doesn’t cross-thread.

MXU450i_80

Tighten the spark plug to specification with a deep well 5/8 in. spark plug socket. Do not over tighten the spark plug. The cylinder head is made out of soft metal, and it can be easily damaged.

Spark Plug Torque: 10 Nm, 1.0 kgf-m, 8.7 ft-lb

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Install the spark plug cap onto the spark plug.

Steering and Suspension

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Steering and Suspension Inspection

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Place the vehicle on level ground. Move the suspension up and down and make sure it moves smoothly and returns to its original position. See the Front Suspension and Rear Suspension chapters for more information.

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Inspect the tie-rod ends. Replace the tie-rod ends if either tie-rod end has any play. See the Steering Rack topic for more information on the tie-rods.

Toe-In Adjustment

Place the vehicle on a level surface and check the air pressure is in specification before proceeding. See the Tires topic for more information.

Have the steering wheel pointing straight ahead.

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Place a mark on the center front of both of the front tires.

Toe_In_Adj_600

Measure the distances between the center marks on the tires and call this measurement A. Rotate the marks so that they are now at the back of the tire. Measure the marks again on the rear of the tires. Call the rear measurement B.

Find the difference between A from B to get the toe-in measurement.

B – A = toe-in

The toe-in should be 0 ~ 15 mm (0 ~ 0.59 in)

Steering and Suspension Adjustment

Mark both tie-rods so the amount the rod is turned can be observed.

UXV500_359_ill-600

Loosen the left and right outer tie-rod locknuts with a 19 mm wrench. Hold the tie-rod end and turn the tie-rod. Turn both the tie-rods evenly until the toe-in is within specification. Moving the tie-rods out towards the wheels will increase toe-in. Moving the tie-rods towards the center will decrease toe-out. Temporarily tighten the tie-rod locknuts with a wrench and re-check the toe in.

Toe-in: 0 – 15 mm (0 – 0.6 in).

Tighten the tie-rod locknuts to specification with a 19 mm wrench.

Tie-rod lock nut: 4.0 kgf-m (40 Nm, 28 ft-lb)

After adjusting the toe-in, take the vehicle for a slow test ride. If the machine pulls to the left or right when the steering wheel is facing straight ahead the toe-in needs to be readjusted more evenly.

Throttle Free Play

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Throttle Free Play Inspection

UXV500_213Ill-600

Inspect the throttle free play by operating the throttle pedal. The end of the throttle pedal should travel 3 – 5 mm (0.12 – 0.20 in) before the cable slack is taken up and the throttle begins to open.

When the throttle pedal is pushed all the way in and released it should return to its resting position quickly. Also, the throttle operation should be smooth.

Throttle Free Play Adjustment

Inline Adjustment

Remove the seat. See the Seat topic for more information.

UXV450i_0270

Locate the throttle cable adjuster near the CVT cover. Pull back the rubber covers from the throttle cable adjuster. To adjust the throttle free play loosen the lock nut on the throttle cable with an 8 mm wrench and turn the adjuster with an 8 mm wrench. Turn the adjuster out to decrease free-play and turn it in to increase free-play. Always check that the throttle operates freely and returns properly. Tighten the lock nut securely.

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Return the rubber covers over the throttle cable adjuster.

Pedal End Adjustment

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Remove the pedal plate trim clips. Remove the pedal plate.

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The throttle cable free play can be adjusted near the pedal end of the cable. Use a 10 mm wrench to turn the nuts.

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Loosen the locknut (1) and turn the adjuster nut (2) to set the proper throttle free play. Tighten the nuts locknut securely when finished.

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Install the pedal plate and trim clips.

Tires and Wheels

Inspect the tires for correct tire pressure. An under or over inflated tire can increase tire wear and affect steering. Maintain correct tire pressure for safety and to maximize tire life. Vehicle instability can also be caused by improper tire size.

Tire Size

Front: 25X8-12
Rear: 25X10-12

Tire Pressure

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Check the tire pressure with a low pressure gauge.

Front: 0.7 kgf/cm2 (10 psi)
Rear: 0.98 kgf/cm2 (14 psi)

Raptor350_1010-600

The tread depth should be even and sufficient with a minimum depth of 3 mm.

Valve Clearance

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

The valve clearance should only be checked when the engine is cold (below 35°C or 95°F).

Valve Clearance Inspection

Remove the following components in order to inspect the valve clearance:

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The valve adjuster covers are each held on with two bolts. Remove the valve adjuster cover bolts with an 8 mm socket.

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Lift off the valve adjuster covers.

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Inspect the valve adjuster cover O-rings and replace them as needed.

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Remove the crankshaft cap on the stator side of the engine with a 10 mm Allen socket. Inspect the O-ring and replace it as needed.

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Loosen the timing inspection plug with an 8 mm Allen. Remove the timing inspection plug and sealing washer.

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Turn the crankshaft counterclockwise with a 22 mm socket.

MXU450i_387

Align the “T” mark on the flywheel with the index mark on the crankcase cover. This shows the piston is at Top Dead Center (TDC).

MXU450i_389

The piston should now be at TDC (Top Dead Center) on the compression stroke. You can make sure that it is on the compression stroke by checking that there is some slack in the rocker arms. If the rocker arms are rigid, rotate the crankshaft 360 degrees counterclockwise until the “T” mark is once again aligned with the notch on the case cover. There should now be slack in the rocker arms and the piston should be at TDC on the compression stroke.

MXU450i_94

Measure the valve clearance with a thickness feeler gauge. Insert the feeler gauge between the adjusting screw and the valve stem. The clearance is correct when there is a light drag on the feeler gauge. If the clearance is out of spec move on to the adjustment section.

Intake: 0.1 mm (0.004 in) (cold)
Exhaust: 0.17 mm (0.007 in) (cold)

UXV500_357-tool-600

Use a valve adjuster tool to adjust the valves.

Special Tool- Valve Adjuster: A120E00036

MXU450i_95

Loosen the valve adjuster locknut with a wrench. Use the valve adjuster tool to turn the adjuster in or out. If the valve clearance is too tight back out the valve adjusting screw with the valve adjustment tool. If the clearance is too loose turn in the valve adjusting screw until there is a light drag on the feeler gauge. Hold the adjusting screw locknut in place with the wrench to make sure it doesn’t interfere with the adjustment. Hold the adjuster in place when you tighten the locknut. Always recheck the clearance after tightening the locknut.

Tappet Adjustment Nut: 10 Nm, 1.0 kgf-m, 6.5 ft-lb

MXU450i_91

Install the timing inspection plug with a new sealing washer. Tighten it securely with an 8 mm Allen.

MXU450i_89

Make sure the crankshaft cap O-ring is in good condition. Apply fresh engine oil to the O-ring. Install the crankshaft cap. Tighten the crankshaft cap securely with a 10 mm Allen socket. Do not over tighten this cap.

MXU450i_86

Make sure the valve adjuster cover O-rings are in good condition. Apply a light coat of fresh engine oil to the O-rings. Fit the valve adjuster cover into place. Install the valve adjuster cover bolts. Tighten the bolts securely with an 8 mm socket.

Install the following components:

Hood

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Hood Removal

UXV450i_0061

Pull up on the front of the hood and then move it forward and off of the vehicle.

Hood Installation

UXV450i_0060

Fit the tabs into place on installation.

UXV450-full-hood

Front Storage Box

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Remove the hood. See the Hood topic for more information.

UXV450i_0063

Remove the six bodywork bolts with a 10 mm socket.

UXV450i_0210

Release the latches and open the storage box lid. Remove the center bolt with a 10 mm socket and the two screws with a #3 Phillips. Remove the front storage box.

Assembly is the reverse of disassembly.

Instrument Cover

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Remove the following components:

UXV450i_0233

Remove the two parking brake lever bolts with a 5 mm hex socket.

UXV450i_0234

Remove the parking brake lever.

UXV450i_0237

Unplug the headlight switch connector.

UXV450i_0239

Unplug the 2WD/4WD switch connector.

UXV450i_0241

Unplug the display meter connector.

UXV450i_0245

Unplug the seat belt light connector.

UXV450i_0247

Unplug the 12V acc. power connectors.

UXV450i_0249

Unplug the ignition switch connector.

UXV450i_0250

Lift off the instrument cover.

UXV450i_0254

Remove the four screws to remove the display meter from the cover.

Assembly is the reverse of disassembly.

Seat

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Cushion

UXV450i_0018

Note how the seat cushion is positioned before removal.

UXV450i_0019

Pull up on the seat cushion to free it.

UXV450i_0020

Free the seat cushion posts from their grommets.

UXV450i_0021

Remove the seat cushion.

Assembly is the reverse of disassembly.

Backrest

UXV450i_0112

Lift up the cargo be to access the back of the seat backrest. Remove the nuts from the back of the seat backrest.

UXV450i_0115

Remove the seat backrest from the vehicle.

Assembly is the reverse of disassembly.

Headrest

UXV450i_0169

This vehicle has two headrests.

UXV450i_0168

Remove the screws with a #3 Phillips screwdriver to remove the headrests.

Assembly is the reverse of disassembly.

Seat Bracket

UXV450i_0116bolts

Note the location of the seat bracket bolts.

UXV450i_0114

Remove the seat bracket bolts with a 10 mm socket.

UXV450i_0117

Remove the seat bracket.

Assembly is the reverse of disassembly.

Seat Belts

UXV450i_0166

Remove the upper seat belt cover. Hold the seat belt bolt with a 17 mm socket.

UXV450i_0167

Loosen the nut with an 18 mm socket. Remove the nut, bolt, and washer. Free the upper seat belt from the canopy.

UXV450i_0164

Hold the lower seat belt bolt with a 17 mm socket. Loosen the nut with an 18 mm socket. Remove the nut and bolt. Free the lower seat belt mount from the frame.

UXV450i_0163

UXV450i_0162

Remove the nut and bolt for the seat belt spool with a 17 and 18 mm socket. Remove the seat belt from the frame.

UXV450i_0290

Use a 17 mm and 18 mm socket to remove the seat belt latch nut and bolt.

Install the seat belt components and tighten the nuts to specification.

Seat belt and frame: 5.9 kgf-m, (59 N-m, 42 ft-lb)

UXV450i_0165

Install the upper seat belt cover.

Frame Covers / Skid Plates

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Under Seat Panel

Remove the seat and seat bracket. See the Seat topic for more information.

UXV450i_0118ill

UXV450i_0119ill

Remove the bolts and trim clips.

UXV450i_0120

Remove the under seat panel.

Assembly is the reverse of disassembly.

Side Covers

Remove the following components

UXV450i_0148

Remove the side cover bolts on the inside of the floor panel.

UXV450i_0145-2

Remove the two trim clips from the front of the side cover, and the two bolts from the rear of the side cover.

UXV450i_0146

Remove the three trim clips under the side cover.

UXV450i_0147

Remove the three trim clips from the rear of the side cover.

UXV450i_0152

Remove the single trim clip that connects the side cover to the splash panel.

UXV450i_0150

Temporarily remove the fuel tank cap to remove the tight side cover.

UXV450i_0149

Remove the side cover.

UXV450i_0151

uxv450-side-covers

Disassemble the three parts of the side cover if needed.

Assembly is the reverse of disassembly.

Front Side Covers

Remove the following components:

uxv450-front-side-covers

UXV450i_0187

Remove the two bolts and trim clip from the outside of the front side cover.

UXV450i_0188

Remove the inside bolt with the net door latch.

UXV450i_0190mod

Free the front side cover tabs from the slots.

UXV450i_0189

Remove the front side cover.

Assembly is the reverse of disassembly.

Splash Panels

Remove the following components:

uxv450-splash

UXV450i_0154

Remove the center splash panel trim clips.

UXV450i_0155

Remove the center splash panel.

UXV450i_0156

UXV450i_0157

Remove the outer splash panel trim clips.

UXV450i_0158

UXV450i_0159

Remove the outer splash panels.

Assembly is the reverse of disassembly.

Front Left Inner Cover

UXV450i_0257

Remove the trim clip.

UXV450i_0258

Remove the front left inner cover.

UXV450i_0257

To assemble, fit the front left inner cover into place on the frame and install the trim clip.

Skid Plates

UXV450i_0642

Remove the skid plate fasteners with a T30 Torx bit and remove the skid plates. To assemble, fit the skid plates into place and tighten the fasteners securely.

uxv450-skid-plates

Seat Cross Pipe

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

UXV450i_0074

Pull the lever and tilt back the cargo bed.

UXV450i_0019

Remove the seat. See the Seat topic for more information.

UXV450i_0120

Remove the rear frame covers, splash panels and under seat panel. See the Frame Covers topic for more information.

UXV450i_0175

Remove the canopy. See the Canopy topic for more information.

UXV450i_0299

UXV450i_0276

Free the wire harness from the seat cross pipe. Note the routing for installation.

UXV450i_0301

Remove the four right storage box bolts.

UXV450i_0302

Remove the right storage box.

UXV450i_0297

Remove the airbox. See the Airbox topic for more information.

UXV450i_0264

The fuse box is secured to the battery box. When it is installed it should click securely into place.

UXV450i_0272

Free the fuse box from the back of the battery box.

UXV450i_0306

Remove the battery. See the Battery topic for more information.

UXV450i_0307

The starter solenoid is secured in place by plastic mounts that fit into the rubber cover slots.

UXV450i_0308

Lift the starter solenoid out of the battery box.

UXV450i_0313

Remove the four battery box mounting bolts with a 12 mm socket.

UXV450i_0314

Remove the battery box.

UXV450i_0300

Remove the CVT duct bolt and nut with a 10 mm wrench.

UXV450i_0318

Remove the seat cross pipe mounting bolts with a 12 mm socket.

UXV450i_0319

Remove the seat cross pipe from the frame.

Assembly is the reverse of disassembly.

UXV450i_0073

Push the cargo bed down and lock it into place to complete assembly.

Front Bumper

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Remove the following components:

UXV450i_0131tc

The front bumper trim panel has two trim clips.

UXV450i_0132

Remove the trim clips.

UXV450i_0133

Remove the front bumper trim panel.

UXV450i_0140b

UXV450i_0141

Remove the bumper holder bolts with a 12 mm socket.

UXV450i_0142

Remove the bumper holders.

uxv450-bumper

UXV450i_0140

UXV450i_0139

Remove the front bumper cover bolts.

UXV450i_0143

Remove the front bumper cover.

UXV450i_0204

Remove the front skid plate bolts with a 10 mm socket.

UXV450i_0205

Remove the front skid plate.

UXV450i_0206

UXV450i_0207

Remove the front bumper brace mounting bolts with a 12 mm socket.

UXV450i_0208

Remove the front bumper brace.

Assembly is the reverse of disassembly.

Front Fender

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Trim Clips

  • When removing frame covers, use special care not to pull them by force because the cover joint claws may be damaged.
  • Make sure to route cables and harnesses according to the Cable & Harness Routing.

Screw Type

UXV500_98trim-clip-600

Back the screw out with a Phillips screwdriver to unlock the screw type trim clips. Install the trim clip and then turn in the screw to lock the clip in place.

Front Fender Mudguards

Remove the hood. See the Hood topic for more information.

uxv450-mud

Note the location of the screws and trim clips.

UXV450i_0121

UXV450i_0123

Remove the screws and trim clips.

UXV450i_0124

Remove the mudguard.

Installation is the reverse of disassembly.

Top Panel Covers

UXV450i_0125

Each of the top covers are held in place with two trim clips.

UXV450i_0125ill

Remove the top cover trim clips.

UXV450i_0127

Free the top cover tabs from the slots.

UXV450i_0126

Remove the top covers.

UXV450i_0128

Remove the bolts and trim clips from the top panel cover.

UXV450i_0129

Remove the two trim clips from above the meter.

UXV450i_0130

Remove the top panel cover.

Installation is the reverse of disassembly.

Front Fenders

uxv450-front-fender

Remove the front bumper. See the Front Bumper topic for more information.

UXV450i_0175

Remove the canopy bars. See the Canopy topic for more information.

UXV450i_0176

UXV450i_0178

Remove the front fender bolts.

UXV450i_0177

UXV450i_0179

Remove the trim clips.

UXV450i_0180

Unplug the headlight connectors.

UXV450i_0181

UXV450i_0182

Remove the front fenders with headlights.

UXV450i_0183

Remove the bolts to free the fender from the headlight.

Installation is the reverse of disassembly.

Floor Panel

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Remove the following components:

Uxv450-floor-panel

UXV450i_0184

Remove the tunnel cover screws and trim clips.

UXV450i_0185

Remove the tunnel cover.

UXV450i_0186

Remove the pedal plate trim clips. Remove the pedal plate.

UXV450i_0191

UXV450i_0192

Remove the bolt and two trim clips with the cup holders. Remove the cup holders.

UXV450i_0193

Remove the four glove holder trim clips. Remove the glove holder.

UXV450i_0194

UXV450i_0195

UXV450i_0198

UXV450i_0202

Remove the floor panel bolts.

UXV450i_0203

Remove the floor panel.

Assembly is the reverse of disassembly.

Canopy

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Remove the following components:

UXV450i_0169bolts

Rear the rear brace bolts with a 12 mm socket. Remove the rear brace.

UXV450i_0170

Remove the cross tube bolts with a 12 mm socket. Remove the cross tube.

UXV450i_0172

Loosen the rear canopy bar bolts with an 8 mm hex socket.

UXV450i_0174

UXV450i_0173

Hold the lower canopy bar nuts with a wrench and loosen the bolts with an 8 mm hex socket.

UXV450i_0171

Remove the canopy bar nuts and bolts.

UXV450i_0175

Remove the canopy bars.

UXV450i_0172

Installation is the reverse of removal. Tighten the canopy bar bolts to specification with an 8 mm hex socket.

Canopy Bar Bolts: 6.4 kgf-m (64 Nm, 45 ft-lb)

Tighten the cross tube and rear brace bolts to specification with a 12 mm socket.

Cross Tube, Rear Brace Bolts: 3.2 kgf-m (32 Nm, 22.7 ft-lb)

Cargo Bed

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Operation

UXV450i_0068

UXV450i_0071

Use the latch to open the tailgate storage compartment.

UXV450i_0069

Use the latch levers to open and close the tailgate.

UXV450i_0073

UXV450i_0074

Use the latch to unlock and lift the cargo bed.

Cargo Bed

UXV450i_0077

Unplug the taillight connectors. There is one for each side.

UXV450i_0106

Free the taillight wires from the cargo bed.

UXV450i_0104

Hold the lift assist strut with a 12 mm wrench and remove the nuts with a 12 mm socket. Free the left and right lift assist struts from the bed.

UXV450i_0105

With the help of an assistant support the bed in the closed position. Remove the locking clips.

UXV450i_0103

Slide out the hinge pins.

UXV450-bed-removal

Lift off the bed with the help of an assistant or use a suitable hoist.

UXV450i_0107

Remove the lower nuts to remove the assist struts from the frame if necessary.

UXV450i_0108

UXV450i_0110

Inspect the rubber bumpers for damage and deterioration. Remove the two bolts on each side to remove the heat shield if needed.

Assembly is the reverse of disassembly.

Tailgate

UXV450i_0095

To remove the tail gate plate, remove the screws with a Phillips screwdriver.

UXV450i_0096

Remove the tail gate plate if necessary.

UXV450i_0095cable

UXV450i_0102

Remove the cable bolts and remove the cables from the tailgate.

UXV450i_0097

Remove the two pivot covers screws with a Phillips screwdriver. Remove the pivot cover from each side of the tailgate.

UXV450i_0098

Remove the pivot plate screws with a Phillips screwdriver.

UXV450i_0099

Remove the pivot plates.

UXV450i_0100

Remove the tailgate.

Assembly is the reverse of disassembly.

Rear Fender

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Trim Clips

  • When removing frame covers, use special care not to pull them by force because the cover joint claws may be damaged.
  • Make sure to route cables and harnesses according to the Cable & Harness Routing.

Screw Type

UXV500_98trim-clip-600

Back the screw out with a Phillips screwdriver to unlock the screw type trim clips. Install the trim clip and then turn in the screw to lock the clip in place.

Rear Fender Removal

UXV450i_0073pins

UXV450i_0073pin

Remove the trim clips from the top of the fender.

UXV450i_0075

Remove the trim clip under the fender.

UXV450i_0076

Hold the front tie-down ring bolts with a wrench.

UXV450i_0074

Loosen the cap nuts with a 10 mm socket. Remove the cap nuts and front tie-down rings and bolts.

UXV450i_0077

Unplug the taillight connector.

UXV450i_0078

Remove the fender.

UXV450i_0079

Remove the taillight screws with a #2 Phillips screwdriver to remove the taillight from the rear fender.

UXV450i_0084

Free the taillight assembly from the tabs on the rear fender and removed it.

UXV450i_0094

Remove the screws with a #2 Phillips screwdriver to remove the molding from the bottom of the fender.

Installation is the reverse of disassembly.

Exhaust System

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

WARNING: Exhaust systems reach a very hot temperature after the vehicle has been running. Wait for the exhaust system to cool down to prevent severe burns.

Always replace the exhaust gaskets when removing and installing the exhaust system to prevent an exhaust leak.

Removal

Remove the cargo bed. See the Cargo Bed topic for more information.

UXV450i_0430

Use a spring puller to free the exhaust springs from the head pipe.

UXV450i_0429

Remove the head pipe nuts with a 12 mm socket.

UXV450i_0431

Slide the head pipe back to free it from the head and muffler.

UXV450i_0432

Remove the head pipe from the vehicle.

UXV450i_0435

Slide the muffler back to free the hangers from the rubber grommets, remove the muffler from the vehicle.

Installation

UXV450i_0427

Check that the rubber grommets are in good condition, fit the muffler hangers into the grommets.

UXV450i_0433

UXV450i_0431

Fit the new exhaust gaskets into place. Align the head pipe with the cylinder head and muffler while installing the head pipe.

UXV450i_0428

Use a spring puller to install the exhaust springs, make sure the springs are securely locked into place.

UXV450i_0429

Tighten the head pipe nuts evenly a little at a time until you reach the tightening specification.

Head Pipe Nut Torque: 2.0 kgf-m (20 N-m, 15 ft-lb)

Install the cargo bed. See the Cargo Bed topic for more information.

Spark Arrestor

UXV450i_0425

Remove the three spark arrestor bolts with an 8 mm socket.

UXV450i_0426

Remove the spark arrestor and gasket.

MXU450i_34-sa

Clean the carbon off of the spark arrestor screen with a wire brush. Inspect the spark arrestor screen for any damage and replace as needed.

UXV450i_0425

Install the spark arrestor with a new gasket. Install the spark arrestor bolts and tighten them securely with an 8 mm socket.

Spark Arrestor: 5.4 Nm, 0.54 kgf-m, 48 in-lb

Shifter

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Handle

UXV450i_0231

Remove the two shifter handle screws with a #2 Phillips screwdriver.

UXV450i_0232

Remove the shifter handle.

To reinstall, fit the handle into place and tighten the screws securely.

Adjustment

Note: Improper shifter adjustment can cause transmission damage.

UXV450i_0120

Remove the under seat panel to gain access to the lower cable adjustment.

UXV450i_0639

Loosen the lock nuts with a 17 mm wrench and move the cable in or out to change the engagement position of the shifter.

UXV450i_0056

Check the shifter position as you adjust the cable, make sure the shifter allows the transmission to fully engage each position and that it is properly indicated on the display meter. Tighten the lock nuts securely when finished adjusting.

Cable Removal

UXV450i_0250

Remove the instrument cover. See the Instrument Cover topic for more information.

UXV450i_0595

Remove the mounting bolts with a 12 mm socket to free the shifter assembly from the frame.

UXV450i_0638

UXV450i_0637

Loosen the lock nuts with a 17 mm socket to free the cable from the upper mounting bracket.

UXV450i_0436

Remove the pinch bolt from the shift linkage with a 10 mm socket and free the shift linkage from the shift shaft.

UXV450i_0438

Loosen the lock nuts with a 17 mm socket and remove the lower portion of the cable from the mounting bracket.

Installation

UXV450i_0639

UXV450i_0638

Fit the upper and lower portion of the cable adjusters into the mounting brackets.

UXV450i_0437

Fit the gear shift linkage into place while aligning the punch marks on the shaft and arm. Tighten the pinch bolt securely.

UXV450i_0595

Mount the shifter assembly onto the frame and tighten the mounting bolts securely.

UXV450i_0250

Install the instrument cover. See the Instrument Cover topic for more information.

Adjust the gear shifter position as describe in this chapter and tighten the lock nuts securely.

Cooling System Inspection

SAFETY FIRST: Antifreeze is highly toxic and can kill pets and animals if drank. Do not leave coolant where animals (including children) can get to it. Protective gloves and eyewear are recommended at this point.

CAUTION: Never remove the radiator cap when the engine is hot.

  • Perform this operation when the engine is cold.
  • To inspect the coolant level see the Coolant topic.

Pressure Testing

UXV450i_0063

Remove the hood. See the Hood topic for more information.

UXV450i_0066

Remove the radiator cap in two stages so that any built up pressure can vent before you remove it. Remove the radiator cap by pushing down and turning it.

radiator_pressure_test-600

When checking the cooling system for leaks you will need a pressure tester. Remove the radiator cap, wet the tester seal, and install the end of the pressure tester onto the filler neck. Pump the tester up until the gauge reads 0.9 kg/cm2 or 12.8 psi. The cooling system should hold this pressure for at least 6 seconds. If it does not you will need to inspect the entire system for leaks. Do not pressurize the cooling system more than 1.05 kg/cm2 or 14.9 psi.

radiator-cap-test-600

Wet the seal on the radiator cap and install it to the pressure tester. Replace the cap if it does not relieve the pressure as specified.

Radiator cap relief pressure: 90 kPa (0.9 kgf/cm2, 12.8 psi)

UXV450i_0065

Reinstall the radiator cap.

Radiator

SAFETY FIRST: Antifreeze is highly toxic and can kill pets and animals if drank. Do not leave coolant where animals (including children) can get to it. Protective gloves and eyewear are recommended at this point.

CAUTION: Never remove the radiator cap when the engine is hot.

Radiator Removal

Remove the following components:

UXV450i_0288

Remove the two radiator reservoir mounting bolts with a 10 mm socket. Remove the reservoir tank.

UXV450i_0605

Squeeze and slide back the clamps on the siphon and air bleed hoses using a pair of pliers. Free the siphon hose from the side of the filler neck and the air bleed hose from the back of the filler neck.

UXV450i_0602

Loosen the upper radiator hose clamp with a #2 screwdriver. Free the upper coolant hose from the radiator.

UXV450i_0603

Loosen the lower radiator hose clamp with a #2 screwdriver. Free the lower coolant hose from the radiator.

UXV450i_0343

Unplug the radiator fan connector.

UXV450i_0604

Free the cable secured by the stay on the radiator fan mount.

UXV450i_0289m

If the radiator grill needs to be removed, loosen and remove the four radiator grill bolts using a 10 mm socket.

Remove the radiator from the frame. Inspect the rubber grommets and replaced them if they are in poor condition.

To remove the fan take off the four mounting nuts with a 10 mm socket.

Radiator Inspection

Radiator Fins

Radiator_fins-600

Inspect the radiator fins for damage and clogging. Clean out the fins with low pressure compressed air and water.

NOTE: Always wear safety glasses when using compressed air and never point it directly at yourself or anyone else.

Check the radiator for any bent or damaged fins. Use a small flat blade screwdriver to straighten them out, but be careful not to puncture the radiator.

Radiator Fan Testing

Jump a 12 volt battery to the fan connector and make sure the radiator fan operates.

To inspect the water temperature sensor (WTS) see the FI Sensors topic.

Radiator Installation

If the radiator fan was removed, reinstall the fan and tighten the four nuts securely with a 10 mm socket.

UXV450i_0289m

Fit the radiator into place.

UXV450i_0604

Install the four radiator mounting bolts and tighten them securely with a 10 mm socket. Secure the cable with the stay on the radiator fan mount.

UXV450i_0287

Install the radiator grill and tighten the bolts securely with a 10 mm socket.

UXV450i_0343

Plug in the radiator fan connector.

UXV450i_0603

Connect the lower coolant hose to the radiator. Install the clamp and tighten it securely with a #2 Phillips screwdriver.

UXV450i_0602

Connect the upper coolant hose to the radiator. Install the clamp and tighten its securely with a #2 Phillips screwdriver.

UXV450i_0605

Connect the siphon hose to the side of the filler neck and the air bleed hose to the back of the filler neck. Secure the hoses with the clamps.

UXV450i_0288

Install the reservoir tank. Install the two mounting bolts and tighten them securely with a 10 mm socket.

Install the following components:

Water Pump

SAFETY FIRST: Antifreeze is highly toxic and can kill pets and animals if drank. Do not leave coolant where animals (including children) can get to it. Protective gloves and eyewear are recommended at this point.

Water Pump Inspection

MXU450i_575

Inspect the telltale hole at the bottom of the water pump for signs of coolant. If coolant is detected then the mechanical seal must be replaced.

Water Pump Removal

Remove the following components:

Impeller Housing

UXV450i_0423-hose

Loosen the coolant hose clamps with a #2 Phillips screwdriver.

  1. Radiator
  2. Cylinder
  3. Thermostat

UXV450i_0424

Free the coolant hoses from the water pump.

MXU450i_492

The impeller cover is held in place by four bolts.

MXU450i_494

Remove the four impeller cover bolts with an 8 mm socket.

MXU450i_495

Remove the impeller cover.

MXU450i_497

Remove the impeller cover O-ring and discard it.

MXU450i_496

Inspect the impeller for damage.

Water Pump Cover

MXU450i_498

Loosen the water pump cover bolts in a crisscross pattern with an 8 mm socket.

MXU450i_500

Remove the water pump cover bolts.

MXU450i_501

Remove the water pump cover and old gasket.

MXU450i_503

Remove the two water pump cover dowel pins. Remove any remaining gasket material from the mating surfaces.

Water Pump Seal Replacement

MXU450i_504

The water pump driven gear must be removed to access the water pump seal.

Maxxer450i_113

Remove the water pump driven gear snap ring with snap ring pliers.

Maxxer450i_114

Lift off the water pump driven gear.

Maxxer450i_115

Remove the water pump driven gear pin.

Maxxer450i_117

Remove the water pump snap ring with snap ring pliers.

Maxxer450i_118

Lift off the washer.

Maxxer450i_119

Slide out the water pump impeller.

Maxxer450i_121

Remove the mechanical seal from the water pump cover. If the mechanical seal is difficult to remove you can tap the tip of a small sheet metal screw into the inner-metal edge of the seal. Grip the screw with a pair of vise-grip pliers and pull the seal out.

Maxxer450i_123

Remove the oil seal.

Maxxer450i_122

Lubricate the lips of the new oil seal with grease. Drive the new oil seal into place using a suitable driver that is the same outside diameter as the seal. Apply coolant to the new mechanical seal.

Maxxer450i_120

Drive the new mechanical seal into place using a suitable driver that is the same outside diameter as the seal. Make sure the seal is fully seated.

Maxxer450i_119

Install the impeller.

Maxxer450i_118

Place the washer on the impeller shaft.

Maxxer450i_116

Install a new snap ring into the groove with snap ring pliers.

Maxxer450i_115

Install the pin into the impeller shaft.

Maxxer450i_112

Install the water pump driven gear onto the impeller shaft. Secure the water pump driven gear with a new snap ring. Make sure the snap ring fits securely into the groove.

Water Pump Installation

Water Pump Cover

MXU450i_504

Make sure the water pump cover mating surface is clean.

MXU450i_502

Install the two water pump cover dowel pins and a new gasket.

MXU450i_498

Install the water pump cover. Insert the bolts and tighten the evenly to specification in a crisscross pattern with an 8 mm socket.

Water Pump Cover: 10 Nm, 1 kgf-m, 10 ft-lb

Impeller Housing

MXU450i_497

Place a new O-ring on the impeller housing. Apply coolant to the new O-ring.

MXU450i_492

Fit the impeller housing into place. Install the four impeller cover bolts and tighten them securely with an 8 mm socket.

UXV450i_0423-hose

Connect the coolant hoses to the water pump. Tighten the clamps securely with a #2 Phillips screwdriver.

  1. Radiator
  2. Cylinder
  3. Thermostat

Install the following components:

Thermostat

SAFETY FIRST: Antifreeze is highly toxic and can kill pets and animals if drank. Do not leave coolant where animals (including children) can get to it. Protective gloves and eyewear are recommended at this point.

Thermostat Removal

Remove the following components:

UXV450i_0399h

The thermostat is located on the right side of the engine.

  1. Cylinder Head
  2. Radiator
  3. Water Pump

UXV450i_0401

It is not necessary to disconnect the hoses to replace the thermostat. However, if you need to remove the thermostat housing from the vehicle then you will want to loosen the coolant hose clamps with a #2 Phillips screwdriver. Remove the hoses from the thermostat housing.

UXV450i_0411

Remove the two thermostat housing bolts with an 8 mm socket.

UXV450i_0412

Separate the housing cover from the thermostat housing.

UXV450i_0415

Remove the O-ring from the housing cover.

UXV450i_0414

Remove the thermostat.

Thermostat Inspection

Inspect the thermostat at room temperature. If the valve is open the thermostat is defective and needs to be replaced. Inspect the thermostat sealing ring – replace the thermostat if it’s in poor condition. To check the thermostat for proper operation, fill a pan with tap water and suspend the thermostat in it with a piece of wire. The thermostat should be completely immersed in water and should not touch any part of the pan. Place the pan on a burner and heat the water. Gently stir the water and put a thermometer in the pan. When the thermostat starts to open note the reading on the thermometer. Carefully remove the thermostat from the heated water. The thermostat should close once it cools to room temperature.

Valve Starting to Open: 80 – 84 degrees C (176 – 183 degrees F)
Valve Fully Open: 95 degrees C (203 degrees F)
Valve Lift: 8 mm (0.3 in) minimum

Thermostat Installation

UXV450i_0413

Install the thermostat so its air bleed hole faces up and aligns with the tab in the housing.

UXV450i_0415

Install a new O-ring in the housing cover.

UXV450i_0411

Join the housing cover with the thermostat housing. Install the thermostat housing bolts and tighten them securely with an 8 mm socket.

UXV450i_0399h

If the thermostat housing was removed then you will want to reconnect the hoses at this point. Tighten the hose clamps securely.

  1. Cylinder Head
  2. Radiator
  3. Water Pump

Install the following components:

Fuel System

WARNING

Gasoline is very dangerous. When working with gasoline, keep sparks and flames away from the working area.

Gasoline is extremely flammable and is explosive under certain conditions. Be sure to work in a well-ventilated area.

General Service Information

● Be sure to relieve the fuel pressure before fuel pump or fuel hose removal.

● Bending or twisting the control cables will affect operation and could cause the cables to stick or bind, resulting in loss of vehicle control.

● Work in a fully ventilated area. Smoking or allowing flames or sparks in the work area or where gasoline is stored can cause a fire or explosion.

● Do not apply carburetor cleaners to the inside of the throttle body.

● Do not snap the throttle valve from fully open to fully close after the throttle cable has been removed; this may cause incorrect idle speed.

● Do not loosen or tighten the painted bolts and screws of the throttle body. This can cause throttle and idle valve synchronization failure.

● Seal the cylinder head intake ports with tape or a clean towel to prevent dirt and debris from entering the intake ports after the throttle body has been removed.

● Do not damage the throttle body. It may cause incorrect throttle and idle valve synchronization.

● When the fuel pump is removed make sure it is stored in a clean area where it cannot fall and be damaged. Also, be sure the fuel pump isn’t resting on the fuel level sensor float arm.

● Always replace the fuel pump seal when the fuel pump is removed.

● The electronic fuel injection system is equipped with the self-diagnostic system. If the Check Engine Lamp “CELP” lights while riding, follow the self-diagnostic procedures to solve the problem.

● A faulty fuel injection problem is often related to poorly connected or corroded connectors. Check those connections before proceeding.

● When disassembling the fuel injection parts, note the location of the O-rings. Replace them with new ones upon reassembly.

● Do not disconnect the battery negative (-) or positive (+) cable while engine is running, it may cause ECU damage.

● Do not disconnect or connect the ECU connector while the ignition switch is in the ON position; it may cause the ECU damage.

TROUBLESHOOTING

Engine fails to start

  • Battery voltage too low
  • Fuel level too low
  • Pinched or clogged fuel hose
  • Faulty fuel pump operating system
  • Clogged fuel injector
  • Faulty spark plug or wrong type
  • Clogged Airflow Bypass Valve
  • Wet spark plug
  • Backfiring or misfiring during acceleration

  • Ignition system malfunction
  • Engine stall, hard to start, rough idling

  • Intake air leak
  • Fuel contaminated/deteriorated
  • Pinched or clogged fuel hose
  • Idle speed problem
  • Wet spark plug
  • Poor performance (drive ability) and poor fuel economy

  • Pinched or clogged fuel hose
  • Faulty injector
  • Fuel Tank

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    Warning: Gasoline is extremely flammable. Work in an area that is free of open flames and sources of sparks. Properly clean up any spilled gasoline as soon as possible.
    UXV450i_0366fuel
    Inspect the fuel system for damage and deterioration. Replace any hoses as needed.
    To remove the fuel tank you will need to remove the following components:
    UXV450i_0298
    Disconnect the breather hose.
    UXV450i_0383
    Relieve the fuel pressure and disconnect the fuel hose from the fuel pump. See the Fuel Pump topic for more information.
    UXV450i_0349
    Unplug the fuel pump connector.
    UXV450i_0386
    Remove the three fuel tank mounting nuts using a 12 mm socket.
    UXV450i_0384
    The fuel tank is secured by two mounting straps.
    UXV450i_0387
    Remove the two fuel tank straps.
    UXV450i_0388
    Remove the fuel tank from the frame.
    Installation is the reverse of removal. Be sure to tighten the three fuel tank mounting nuts securely.
  • Fuel Pump

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    Warning: Gas is extremely flammable! Do not work around an open flame or a source of sparks.

    Fuel Pressure Relief

    Remove the seat. See the Seat topic for more information.
    UXV450i_0349
    In order to release fuel pressure from the fuel hose, unplug the fuel pump connector. Start the engine and let it run until it dies of fuel starvation. Turn the ignition switch off. Reconnect the fuel pump connector.

    Fuel Line Inspection

    Remove the seat. See the Seat topic for more information.
    UXV450i_0301
    Remove the right storage box. See the Seat Cross Pipe for more information.
    UXV450i_0366fuel
    Note the routing of the fuel line from the fuel pump to the throttle body. Inspect the fuel line and replace as needed.

    Input Voltage Inspection

    UXV450i_0349
    Unplug the fuel pump connector.
    Set the multimeter to read voltage (DCV).
    Touch the multimeter leads to the harness side of the fuel pump connector, with the positive lead touching the orange/red wire terminal and the negative lead touching the green wire terminal.
    Turn the ignition switch ON. The battery voltage should show for a few seconds. Replace the fuel pump if it is not functioning and the input voltage is correct.
    If the battery voltage is not present check the following:
    • Fuse B (10 A)
    • Fuel pump relay
    • ECU

    Fuel Output Pressure

    Turn the key to the OFF position.
    UXV450i_0372
    Use a fuel hose clamp to block the flow of fuel to the fuel injector. Disconnect the fuel hose from the fuel injector pipe. Connect the fuel pressure gauge to the fuel hose. Remove the fuel hose clamp. Turn the key to the ON position. Check the fuel pressure.
    Fuel Pump Standard Pressure (at 80 L/Hr): 300 ± 10 kPa (43.5 psi)
    If the fuel output pressure is less than the specifications If the fuel pressure is below specification check the fuel line for kinks and clogs. Inspect the fuel strainer screen on the fuel pump and the breather hose on the tank.

    Fuel Pump Relay

    Turn the key to the OFF position.
    Open the hood. See the Hood for more information.
    uxv450i-relays
    The fuel pump relay is located near the ECU.
    Lift the fuel pump relay off of the finger on the frame.
    UXV500_480fpr-600
    Remove the fuel pump relay from the connector.

    Continuity Test

    Set the multimeter to read ohms of resistance.
    fprelay-600
    Check for continuity between the terminals of the relay that match up with the red/blue and orange/red wires.
    fuel-relay-600
    Jump a 12 V battery to the terminals of the relay that match up with red/yellow and black/red wires. There should be continuity only when 12 V battery connected. If there is not continuity when the 12 V battery is connected, replace the fuel pump relay.

    Fuel Pump Removal

    Turn the ignition switch off.
    UXV450i_0301
    Remove the right storage box or at least remove the fuel pump cover.
    UXV450i_0349
    Unplug the fuel pump connector.
    UXV450i_0298
    Remove the gas cap to normalize the pressure in the tank. Install the gas gap. With the fuel pump connector still unplugged start the engine and allow it to run until it uses the remaining fuel in the line and stalls. Turn off the ignition switch after the engine stalls.
    UXV450i_0382
    Clean the disconnect fitting and put a rag over it.
    UXV450i_0383
    Push down on the black release and disconnect the fuel fitting from the fuel tank. Place plastic bags over the fuel line ends to keep debris out and prevent damage.
    UXV450i_0389
    Remove the six fuel pump bolts with a 10 mm socket.
    UXV450i_0390
    Remove the fuel pump mounting ring.
    UXV450i_0391
    Carefully lift out the fuel pump.
    UXV450i_0392
    Guide the fuel level float out of the fuel tank with the pump.
    UXV450i_0396
    Remove the O-ring from the fuel pump. Discard the fuel pump O-ring, and replace it with a new item on assembly.

    Fuel Level Gauge Inspection

    fuel-level
    Make sure the fuel level gauge float arm moves smoothly. Using a digital multimeter set to ohms of resistance (Ω). Measure the resistance between the gray wire fuel pump/level gauge connector terminals with the float raised to the positions indicted below.
    Fuel pump resistance (at 20 degrees C/68 degrees F)Float at full position: About 101 ohms
    Float at empty position: About 3 ohms
    Replace the fuel pump unit with a new part if the resistance is out of specification.

    Fuel Pump Installation

    UXV450i_0396
    Replace the O-ring with new item and apply a small amount of fresh engine oil to the new O-ring.
    UXV450i_0392
    Carefully insert the fuel pump into the tank. Avoid damaging the fuel pump wires and fuel strainer.
    UXV450i_0391
    The fuel delivery pipe should face to the rear left corner of the fuel tank.
    UXV450i_0389
    Install mounting plate and the six fuel pump bolts. Tighten the bolts evenly to specification with a 10 mm socket.
    Fuel Pump Bolts: 0.35 Kgf-m (3.5 N-m, 2.5 ft-lb)
    UXV450i_0382
    Connect the fuel hose to the outlet pipe on the fuel pump. Make sure the connector is securely attached to the outlet pipe.
    UXV450i_0349
    Plug in the fuel pump connector.
    UXV450i_0301
    Install the fuel pump cover or the right storage box. See the Seat Cross Pipe for more information.
    Install the seat. See the Seat topic for more information.
  • Diagnostic Trouble Codes

    To evaluate the DTCs see the Check Engine Lamp (CELP) and Diagnostic Tool topics.
    BlinksFailure CodesFault descriptionPriorityFault management
    1P0217Engine temperature overheat11.Stop immediately and check CELP code.
    2. Check if the engine temperature sensor or electric circuit is faulty.
    3. Check engine lubrication and cooling systems.
    4. Check engine ignition and fuel systems.
    2P0335Crankshaft position sensor or circuit malfunction21. Check if the crankshaft position sensor, its connector, or wiring is faulty.
    2. Make sure the generator rotor is aligned with the crankshaft position sensor.
    3P1120Throttle position sensor setting value problem21.Check if the TPS connector or wiring is faulty.
    2.Check if the TPS is adjusted.
    4P1121Throttle position sensor output range problem21. Make sure the TPS connector is connected correctly.
    2. Inspect the TPS

    BlinksFailure CodesFault descriptionPriorityFault management
    5P1122Throttle position sensor movement speed problem21. Make sure the TPS connector is connected correctly.
    2. Inspect the TPS adjustment.
    6P0560Battery voltage malfunction11. Check the battery voltage.
    2. Inspect the charging system.
    7P0110Intake air temperature circuit malfunction2Inspect the T-MAP sensor
    8P0410Idle air valve circuit malfunction21. Check if the ISC connector or wiring is faulty.
    2. Check the resistance of the idle air valve.
    9P0505Idle speed volume control range problem31.Check the ISC steps range with the diagnostic tool.
    2. Check throttle body for carbon deposits.
    3. Check intake for air leaks
    10P0251Injector or electric circuit problem21. Make sure the fuel injector connector is connected correctly.
    2. Check if the ECU sends a signal to the injector.
    3. Check the power source and resistance of the injector.
    4. Make sure the battery is fully charged and connected correctly.

    BlinksFailure CodesFault descriptionPriorityFault management
    11P0350Ignition coil or electric circuit malfunction21. Make sure the ignition coil connector is connected correctly.
    2. Check if the ECU sends a signal to the ignition coil.
    3. Check the ignition coil power source and resistance.
    4. Make sure the battery is fully charged and connected correctly.
    12P0230Fuel pump relay or electric circuit malfunction21. Make sure the relay and pump connectors are connected correctly.
    2. Check if the ECU sends a signal to relay.
    3. Check the fuel pump relay resistance
    13P0219Engine speed has exceeded top speed2Check if the CVT belt is broken.
    14P1560Sensor doesn’t receive power source from ECU21. ECU output to each sensor should be 5 DCV.
    2. Check if the power source for all sensors is 5 DCV.
    3. Check for a problem in the wiring harness.
    4. If the CELP still blinks replace the ECU with a new item even if the output power source of ECU is normal.
    15P0700Engine starting speed exceed CVT speed limited2Not used.
    16P0115Engine temperature sensor or electric circuit malfunction21. Make sure the WTS connector is connected correctly.
    2. Check if the ECU pin is broken.
    3. Check if the resistance of the sensor is out of specification.
    17P1561Temperature gauge electric circuit malfunction2Not used.

    BlinksFailure CodesFault descriptionPriorityFault management
    18P0650CELP electric circuit malfunction31. Check if the CELP bulb is faulty.
    2. Check the CELP wires for damage.
    21P0105Atmospheric Pressure Sensor/Circuit Malfunction21. Make sure the MAP sensor connector is connected correctly.
    2. Check ECU for broken pins.
    3. Check the sensor voltage.
    4. Use Diagnostic Tool to check the pressure.
    22P0110Roll sensor or electric circuit malfunction21. Make sure the sensor is installed in the correct position.
    2. Check the sensor voltage.
    3. Check ECU for broken pins.
  • Diagnostic Tool

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    M3C_11
    Diagnostic tool Part Number: 3620A-LEB2-E00
    CAN Linker Part Number: 3620A-LGC7-E000
    This tool has been developed by KYMCO for KYMCO vehicles only.
    The tool software can be updated for new models with a computer via the USB cable.
    Please refer to the specifications when servicing this vehicle. See the Specifications topic for more information.
    UXV 450i Diagnostic Report ON-ROAD
    UXV 450i Diagnostic Report OFF-ROAD
    This tool does not have an internal battery. The power for the tool is provided by the vehicle when connected. The vehicle should have a fully charged battery when using the diagnostic tool.
    Set the transmission shifter in the P or N position.
    M3C_50
    Plug the diagnostic tool connector into the CAN Linker.
    UXV450i_0063-d-con
    Remove the hood to access the diagnostic connector. See the Hood topic.
    UXV450i_0128-d-con
    The diagnostic connector is located behind the front storage box.
    M3C_48
    Remove the dummy side of the connector.
    Set a multimeter to reads voltage (DCV). Measure the voltage as indicated.
    Terminal (+)Terminal (-)Normal
    BR/LG/BBattery Voltage
    B/LW/LBattery Voltage – 1
    Connect the CAN Linker to the diagnostic plug.
    Turn on the ignition switch to send power to the tool.
    M3C_15
    The FI tool has three buttons and two lights below the screen. The left button is the up button that will move the selector up. The right button is the down button that moves the selector down. The middle button is ENTER. This will select the item you have chosen. The left light indicated the tool has power, and the right light indicates a Diagnostic Trouble Code (DTC) is present.
    The functions of the diagnostic tool include ECU version, model name, data analysis and adjust.
    ECU version: includes model name, ECU number, identifications number and software version.
    DTC Inspect: DTC reading, DTC clearing, and troubleshooting.
    Data Analyze: For ECU’s setting inspection and running condition analysis.
    Adjust: Not allowed

    ECU Version

    M3C_15
    The four functions will display when the tool is powered on. The model name will show LKC3 for the UXV500i and ALE8 for the UXV450i.
    M3C_16
    Pressing the enter button on the ECU version will show information on the ECU software and calibration.
    Press the down button (right) to return to the first page.

    DTC INSPECTION PROCEDURE

    M3C_17
    Press the down button (right) to move the item selector down to the DTC Inspect item.
    M3C_21
    Pressing the enter button on the DTC Inspect item will bring up the options shown above. Select the DTC Load option and press the enter button to display the DTC options.
    M3C_22
    There are three DTC options – Active, Occurred, and History.
    Move the selector to the Active option and press enter to display current DTC.
    M3C_23
    The diagnostic tool will display all current DTC. In the photo above only one code (12) is showing. Select the code number of interest and press enter for more information on that DTC.
    M3C_24
    In this instance the indicated code is 12 (CELP blinks). This corresponds to the DTC P0230.
    BlinksFailure CodesFault descriptionPriorityFault management
    11P0350Ignition coil or electric circuit malfunction21. Make sure the ignition coil connector is connected correctly.
    2. Check if the ECU sends a signal to the ignition coil.
    3. Check the ignition coil power source and resistance.
    4. Make sure the battery is fully charged and connected correctly.
    12P0230Fuel pump relay or electric circuit malfunction21. Make sure the relay and pump connectors are connected correctly.
    2. Check if the ECU sends a signal to relay.
    3. Check the fuel pump relay resistance
    Consult the DTC table for more information on how to troubleshoot the problem. See the Diagnostic Trouble Codes (DTCs) topic
    Up button and select the previous options to return to the original screen.

    DTC Clear Procedure

    M3C_17
    Press the down button (right) to move the item selector down to the DTC Inspect item.
    M3C_31
    Pressing the enter button on the DTC Inspect item will bring up the options shown above. Move the selector down to the Clear DTC option and press enter.
    M3C_32
    The diagnostic tool will show when the DTC in memory is cleared. Also, the DTC indicator light will be off.

    Data Analysis Procedure

    When using the data analysis feature for running condition items such as ignition advance, ISC step, ect., make sure the engine temperature has reached 80° C. The engine temperature is displayed on data analysis page 03.
    M3C_33
    Press the down button (right) to move the item selector down to the DATA Analyze item. Press enter to bring up the DATA Analyze page 01 shown below. Press the down button to continue through the seven DATA Analyze pages.

    Page 01

    M3C_34
    The 01 page shows engine speed, idle speed set point, and battery voltage.

    Page 02

    M3C_35
    The 02 page shows TPS position and TPI idle adapted.

    Page 03

    M3C_36
    The 03 page shows engine temperature, air temperature, and intake pressure.

    Page 04

    M3C_37
    The 04 page shows atmospheric pressure, fuel injection interval, and ignition advance.

    Page 05

    M3C_38
    The 05 page shows the rollover voltage.

    Page 06

    M3C_39
    The 06 page shows the ISC step and ISC learn step.

    Page 07

    M3C_40
    The 07 page shows the ECU counter.
  • Check Engine Lamp

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    Note: The check engine lamp (CELP) will come on for 2 seconds when the key is turned on and then it should go off. If it lights after this the system has detected a problem. The vehicle should be immediately diagnosed as to what is causing the light to come on.
    UXV450i_0057celp
    The check engine lamp (CELP) is located on the instrument display.
    If the ECU connectors, or battery leads are disconnected the stored malfunction codes will be lost.
    CELP-p-600
    There are 3 priority levels of the CELP while the engine is running.
    Priority grade 1: The CELP blinks continuously letting you know this is the most severe condition. The rider must slow and immediately take the vehicle to the dealership service center for evaluation.
    Priority grade 2: The CELP lights and doesn’t blink, but stays on continuously. This shows a component is experiencing trouble or something has gone wrong with a circuit. Evaluate the trouble code to find the source of the problem.
    Priority grade 3: The CELP blinks once and doesn’t come back on. This is a warning. Example – the engine rpm was too high for a short time.

    Self-Diagnostic Procedures

    (Without Diagnostic Special Tool)

    ● Turn key to the ON position.
    ● The CELP will light for two seconds and then go off.
    ● If the engine has problem, the CELP will blink to show the failure codes.
    ● There’re 22 failure codes for the Synerjet M3C system.
    If the vehicle gets multiple failure codes, the CELP will display the lower number code, then progress to the higher number after four seconds. The failure codes will display repeatedly. After the codes cycle four times the codes will clear from the system memory.

    Efi Self-Diagnosis Failure Codes

    The CELP denotes the failure codes. When the indicator lights for one second that is equal to ten. A half second blink is equal to one.
    celp-codes-600
    In the example above the first code has two long blinks (10 X 2) and one short blink (+ 1). This equals 21 blinks.
    (10 X 2) + 1 = 21
    The second code in the example shows three seconds after the first. The second code has two long blinks (10 X 2) and two short blinks (+ 2). This equals 22 blinks.
    (10 X 2) + 2 = 22
    In this example the failure codes corresponding with 21 and 22 blinks need to be evaluated.
    To see the full list of trouble codes see the Diagnostic Trouble Codes (DTCs) topic.

    With Special Tool

    See the Diagnostic Tool topic.

    Self-Diagnosis Reset Procedure

    After the codes cycle four times the codes will clear from the system memory. Always clear the memory after fixing the problem to prevent the light from showing the next time the vehicle is used.

    TPS/ISC Reset

    Start the engine and let it idle until the engine temperature has reached 85° C (185° F). The ECU will learn the new setting.
  • Throttle Body

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    • Turn off the ignition switch during removal/installation.
    • Check and confirm if the voltage is over 12V with a voltmeter after replacement.
    • Check and confirm if the other connectors are installed correctly after replacement.
    • Do not damage the throttle body, it may cause the throttle and idle valve to fail synchronization.
    • The throttle body is preset in the KYMCO factory, do not disassemble it incorrectly.
    • Do not loosen or tighten the painted bolts and screws for the throttle body. Loosening or tightening them can cause the throttle and idle valve synchronization to fail.
    • TPS and ISC have to be reset after the throttle body MAP, TPS, ISC or ECU has been reinstalled.

    Throttle Body Removal

    Remove the following components:
    UXV450i_0355
    Unplug the ISC connector.
    UXV450i_0356
    Unplug the TPS connector.
    UXV450i_0358
    Unplug the T-MAP connector.
    UXV450i_0361
    Remove the two throttle drum cover screws.
    UXV450i_0363
    Remove the throttle drum cover. Slide the throttle cable housing out of the throttle body.
    UXV450i_0364
    Free the throttle cable from the throttle drum.
    UXV450i_0375
    The throttle body is held to the intake pipe with a clamp. Loosen the intake pipe clamp with a #2 Phillips screwdriver.
    UXV450i_0376
    Remove the throttle body from the intake pipe.

    Intake Pipe

    Remove fuel injector. See the Fuel Injector topic for information.
    MXU450i_455
    Remove the two intake pipe bolts that hold the intake pipe to the cylinder head.
    MXU450i_458
    Remove the intake pipe from the cylinder head.
    MXU450i_459
    Remove the O-ring from the intake
    To disassemble the throttle body see the Throttle Body Components topic for more information.

    Throttle Body Installation

    Intake Pipe

    Install a new intake pipe O-ring. If this O-ring allows an air leak the engine will not run correctly.
    MXU450i_455
    Fit the intake pipe onto the cylinder head. Install the intake pipe and tighten the bolts securely with a 10 mm socket.
    Install the fuel injector. See the Fuel Injector topic for information.

    Throttle Body

    UXV450i_0375
    Fit the throttle body into place. Make sure the ridge on the throttle body fits into the gap on the intake pipe fitting.
    Tighten the intake pipe throttle body clamp securely with a #2 Phillips screwdriver.
    UXV450i_0363
    Fit the end of the throttle cable into the throttle drum. Fit the throttle cable into the throttle body.
    UXV450i_0361
    Install the throttle drum cover. Install the two throttle drum cover screws and tighten them securely with a #2 Phillips screwdriver.
    UXV450i_0358
    Plug in the T-MAP connector.
    UXV450i_0356
    Plug in the TPS connector.
    UXV450i_0355
    Plug in the ISC connector.
    Inspect the throttle freeplay. See the Throttle Free Play topic for more information.
    Install the following components:
  • Fuel Injector

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    Warning: Gas is extremely flammable! Do not work around an open flame or a source of sparks.

    Fuel Pressure Relief

    Remove the seat. See the Seat topic for more information.
    UXV450i_0349
    In order to release fuel pressure from the fuel pipe when removing the fuel injector, unplug the fuel pump connector. Start the engine and let it run until it dies of fuel starvation. Turn the ignition switch off. Reconnect the fuel pump connector.
    UXV450i_0389
    See the Fuel Pump topic for more information on the fuel pump.

    Fuel Injector Removal

    Remove the seat. See the Seat topic for more information.
    UXV450i_0360
    Push in the spring clip and unplug the fuel injector connector.
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    Open the fuel injector hose clamp.
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    Disconnect the fuel hose from the fuel injector.

    Fuel Injector Disassembly

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    Remove the two fuel injector mounting bolts with a 10 mm socket.
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    Remove the fuel injector and pipe from the intake pipe.
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    Slide off the clip.
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    Pull the fuel injector out of its pipe. Discard the O-rings.

    Fuel Injector Inspection

    A digital multimeter is needed to test the fuel injector. Set the multimeter to read ohms of resistance.
    M3C_80
    Measure the resistance between the fuel injector terminals
    Fuel injector resistance (at 20 degrees C/68 degrees F): 10.6-15.9 ohms

    Fuel Injector Cleaning

    Problem

    1. Fuel Injector will not dispense fuel.
    2. The Injector injection time (ms) is shorter or longer.
    Standard: < 1.6 ms. Check this with the FI Tool DATA Analyze page 04. See the Diagnostic Tool topic for more information.

    Analysis

    Injector block (With carbon build up).

    Solution

    1. Use the specified injector cleaner.
    2. Connect the battery as pictured.
    3. The injector cleaner with the flash relay.
    4. Keeping the fuel injector operating.
    5. Wait for 20-30 minutes.
    6. Clean the carbons completely from the injector.
    13-21_injector-clean

    Fuel Injector Assembly

    M3C_89
    Install new O-rings on the fuel injector. Apply a light coat of fresh engine oil to the fuel injector O-ring seals.
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    Install the fuel injector into the pipe. Install the clip to secure the fuel injector.
    M3C_78
    Install fuel injector and pipe onto the intake pipe. Guide the fuel injector into place, and be sure not to damage the O-ring. Install the two fuel injector mounting bolts and tighten them securely.

    Fuel Injector Installation

    Use a new clamp on the fuel hose.
    UXV450i_0359
    Connect the fuel hose to the fuel injector pipe. Secure the new clap on the fuel hose. Plug in the fuel injector connector.
    Install the seat. See the Seat topic for more information.
  • Disassembly

    Fuel Injector

    See the Fuel Injector topic for information.

    T-MAP Sensor

    M3C_69
    The T-MAP sensor sits on top of the throttle body. Remove the T-MAP sensor set plate screw with a #2 Phillips screwdriver.
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    Remove the T-MAP sensor.

    ISC (Idle Speed Control – Air Bypass Valve)

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    Remove the two ISC screws with a #2 Phillips screwdriver.
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    Remove the ISC from the throttle body. Remove the O-ring from the ISC and discard it. Clean the tip of the ISC valve.

    Inspection

    If the engine is hard to start, stops, or idles rough the ISC may be faulty.
    Use the data analysis feature of the FI Diagnostic Tool to see information on the ISC. See the Diagnostic Tool topic for more information.
    Start the engine and let it run until the engine temperature reaches 80° C.
    M3C_39
    The ISC step should be below 65.

    TPS Sensor

    M3C_77
    The TPS is located on the throttle shaft opposite the throttle drum. Remove the TPS sensor with a #2 Phillips screwdriver.

    Assembly

    The throttle position sensor (TPS) and idle air bypass valve (ISC) have to be reset when the throttle body MAP, TPS, ISC or ECU have been reinstalled.

    TPS/ISC Reset

    Start the engine and let it idle until the engine temperature has reached 85° C (185° F). The ECU will learn the new setting.

    TPS Sensor

    Apply oil onto a new O-ring and place it on the TPS.
    M3C_76
    Install the TPS onto the throttle body so that it returns to the original position. Install and tighten the screw securely with a #2 Phillips screwdriver.

    ISC (Idle Speed Control – Air Bypass Valve)

    M3C_75
    Apply oil onto a new O-ring and place it on the ISC.
    M3C_73
    Install the ISC into the throttle body, being careful not to damage the O-ring. Install the two ISC screws and tighten them securely with a #2 Phillips.

    T-MAP Sensor

    M3C_70
    Apply oil onto a new O-ring and place it on the T-MAP sensor. Install the T-MAP into the throttle body, being careful not to damage the O-ring.
    M3C_68
    Install the T-MAP sensor screw and tighten it securely with a #2 Phillips.
    Install the throttle body. See the Throttle Body topic for more information.
  • FI Sensors

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    You will need a digital multimeter to inspect the sensors.

    Water Temperature Sensor (WTS)

    Removal

    Remove the Cargo bed. See the Cargo Bed topic for more information.
    Drain the coolant. See the Coolant topic for more information.
    Turn the ignition switch to the OFF position.
    UXV450i_0332wts
    The WTS is located on the side of the cylinder head near the spark plug.
    UXV450i_0346
    Push in the spring and unplug the WTS sensor connector.
    UXV450i_0421
    Remove the sensor with a 22 mm wench.

    Installation

    Thread in the WTS. Tighten the WTS to specification with a deep well 22 mm socket.
    Water Temp Sensor: 12 Nm, 1.2 kgf-m, 8.6 ft-lb

    Inspection

    Input Voltage

    Turn the ignition switch to the OFF position.
    UXV450i_0346
    Push in the spring and unplug the WTS sensor connector.
    Set the multimeter to read voltage (DCV).
    Turn the ignition switch to the ON position.
    Measure the input voltage on the harness side of the connector.
    WTS Input Voltage: 5 ± 0.1 V
    If the input voltage is out of specifications check the offending wires for a short or open lead.

    Resistance

    Set the multimeter to ohms of resistance.
    UXV_500-06-16-600
    Suspend the sensor (1) and a thermometer (2) in a pot of coolant with string. Make sure the WTS and the thermometer are not touching the pot. Bring the temperature up to the specification slowly and check the resistance between the sensor terminal and body.
    Temperature: Standard Resistance (approximate)
    -20° C (-4° F): 28.6 kΩ
    20° C (68° F): 3.51 ± 10% kΩ
    40° C (104° F): 1.46 kΩ
    100° C (212° F): 0.176 kΩ

    Temperature and Manifold Absolute Pressure (T-MAP)

    To remove and install the sensors on the throttle body see the Throttle Body Components topic.

    Inspection

    Input Voltage

    Turn the ignition switch to the OFF position.
    UXV450i_0358
    Unplug the T-MAP connector.
    Set the multimeter to read voltage (DCV).
    Turn the ignition switch to ON position.
    Measure if the ECU voltage outputs to the MAP between the following terminals of the MAP connector.
    Violet/Red (+) to Violet/Green (-): 5 V
    If the input voltage is out of specifications check the offending wires for a short or open lead.

    Resistance

    Set the multimeter to ohms of resistance.
    M3C_67-pins-600
    Measure the resistance between the 3 and 4 pins of the T-MAP sensor.
    T-MAP sensor resistance (20°C): 1613 – 2544 ohms
    To replace the T-MAP sensor see the Throttle Body Components topic.

    Throttle Position Sensor

    Inspection

    Input Voltage

    UXV450i_0356
    Unplug the TPS connector.
    Turn the ignition switch to “ON”.
    Measure if the ECU voltage outputs to TPS between the following terminals of the TPS connector.
    Violet/Red (+) to Violet/Green (-): 5 V

    Resistance

    Set the multimeter to ohms of resistance.
    tps-testing-600
    Measure the resistance between the ground (A) and input (C) terminals of the TPS.
    Throttle position sensor (TPS) resistance (at 20 degrees C/68 degrees F): 3500-6500 ohms

    Data Analysis

    Bring up data analysis page 02 to see information on the TPS. See the Diagnostic Tool topic for more information.
    M3C_35
    The TPS voltage should display as indicated in the table per the throttle position.
    Throttle PositionOpening AngleStandard
    Close
    Open> 90 %
    To replace the TPS see the Throttle Body Components topic.

    Ignition Pulse Generator / Crank Position Sensor

    To inspect the ignition pulse generator/crank position sensor see the Ignition System topic.
    To replace the ignition pulse generator/crank position sensor see the Generator Cover topic.

    Roll Sensor / Tip-Over Switch

    Removal and Installation

    uxv450-roll-loc
    Remove the hood to access the roll sensor. See the Hood topic for more information.
    UXV450i_0330
    Remove the two roll sensor nuts. Unplug the roll sensor and remove it. Plug in the roll sensor and install it so the UP mark faces up.

    Inspection

    Turn the ignition switch to the OFF position.
    Remove the roll sensor screws, but leave the sensor plugged in.
    Set the multimeter to read voltage (DCV).
    Turn the ignition switch to the ON position.
    Measure the voltage of the roll sensor wires with the connector plugged in and the sensor in the regular upright attitude.
    Roll Sensor Voltage
    Standard: 0.4-1.4 V
    Over 65 degrees (fall down): 3.7-4.4 V
    Incline the roll sensor 65 ± 10 degrees to the left or right. Check the voltage.
    If this test is to be repeated the ignition switch must be turned OFF to reset the system.
  • Airbox

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    Remove these components.
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    Remove the airbox mounting bolts with a 10 mm socket.
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    Disconnect the breather hose from the airbox boot.
    UXV450i_0024clamp
    Loosen the airbox boot clamp with a #2 Phillips screwdriver.
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    Loosen the air intake tube clamp with a #2 Phillips screwdriver.
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    Free the airbox from the throttle body and the air intake tube. Cover the throttle body mouth with a clean shop rag. Clean out the airbox.
    Installation is the reverse of removal.
  • Engine Removal

    SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
    Remove the seat and backrest. See the Seat topic for more information.
    Remove the cargo bed. See the Cargo Bed topic for more information.
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    Remove the heat shield mounting bolts with a 10 mm socket. Remove the heat shield.
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    Remove the exhaust system. See the Exhaust System chapter for more information.
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    Remove the splash panels and frame covers. See the Frame Covers topic for more information.
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    Remove the canopy bars. See the Canopy topic for more information.
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    Remove the seat cross pipe. See the Seat Cross Pipe topic for more information.
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    Drain the engine oil. See the Engine Oil topic for more information.
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    Drain the coolant. See the Coolant topic for more information.
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    Disconnect the coolant hoses from the water pump cover and ECT housing.
    UXV450i_0374
    Have a rag ready to clean up any fuel spills, free the clamp and disconnect the fuel line.
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    Remove the throttle body. See the Throttle Body topic for more information.
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    Remove the pinch bolt with a 10 mm socket and disconnect the gear shift linkage from the engine.
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    Unplug the speed sensor, stator and crank position sensor.
    UXV450i_0333
    Remove the spark plug cap.
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    Remove the CVT cooling ducts. See the CVT Cover topic for more information.
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    Remove the front and rear drive shaft bolts with a 12 mm socket.
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    UXV450i_0442
    Remove the engine mounting bolts in the front and nuts in the rear with a 14 mm socket.
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    Secure the engine with a hoist or suitable crane and slowly lift the engine out of the frame.