Product Description
PIRANHA 90cc Engine KIT includes 90cc Engine, 19mm Mikuni Carburetor, Wire Harness, CDI, and Ignition Coil.
This engine is a great update for any pit bike, Honda CRF50, Z50, Trail 70, and ATC70!
Features
- Big Valve E22 Performance Head
- 4 Speed semi-auto transmission (4 gears Up)
- Comes complete with Kicker, Intake Manifold, Gaskets, and Gear Shifter.
Engine
| Displacement | 86cc |
| Engine Type | Air Cooled, Single-Cylinder, 2-valve, 4-stroke |
| Bore/Stroke | 47mmx49.5mm |
| Final Drive | Chain |
| Fuel Delivery | No |
| Fuel | Unleaded / 93 Octane |
| Recommended Engine Oil | 10W-40 Petroleum Based (Non-synthetic) |
Ignition
| Kick Start | Yes |
| Electric Start | No |
| CDI | No |
| Auxilliary Output | Yes |
Transmission
| Transmission | 4-Speed Semi Auto (Four Up) |
| Shift-Pattern | Four-speed Transmission: N-1-2-3-4 |
| Clutch | Semi Auto (No hand clutch) |
Type 4-Stroke single-cylinder OHC air-cooled Piranha 90cc
Engine Specs
Bore: 47mm
Stroke: 49.5
Displacement: 86cc
Big Valve E22 Head
Gears: 4-Speed, Bottom neutral
Carb: MIKUNI 19
Ignition: CDI Flywheel type
Starting pit bike engines will take some practice. All pit bike engines have relatively high compression ratios and require a "quality over quantity " approach in order to ensure quick start ups and avoid mechanical mishaps. It is important follow this routine the first few times when first attempting to start your bike.
- Slowly kick engine over until the kick start reaches a compression stroke (the point in which the kick start lever is hardest to push down.)
- Slowly continue to press the kick starter until the engine rotates slightly through the firmest point in the compression stroke.
- Allow the kick start lever to return back its top rest position
- With a quick and balanced motion - Move down forcefully on the kick lever. These motors need a strong, quick kick to get started.
- If you fail to follow this procedure, especially with longer stroke engines or 125cc + bores you can cause serious damage to your crankcase, clutch and transmissions assemblies!
Tips to Avoid kickback
- Hold onto the crossbar pad with your throttle hand while kicking the bike over to avoid twisting the throttle open by accident
- Before start up - turn the idle screw on the carburetor in a turn or 2 (turn the screw back out to normal idle setting once running.)
- Use a digital CDI with variable ignition timing at start-up, this will help reduce kick back and allow the bike to start much easier compared to the stock CDI unit.
- If ignition timing is adjustable it should be adjusted to the minimum
- Furious, repeated kicking will not get the engine started - firm, full stroke kicks are the only way to get them to start first kick, every time "Quality over Quantity"
- Throttle must be completely closed when you kick the engine over or it will kick back EVERY TIME.
- A small blip of the throttle maybe used when the engine is hot if required but NO more than 10 ° opening of the throttle in any case
