Thumpstar TSR 140-C, a high-performance pit bike with a sleek, aggressive design. The bike features a Tri-Bar Frame, AK7 Alloy Wheels, and VS1 Suspension, highlighting its rugged durability and advanced engineering. The YX-R 140 Engine and Pipe Bomb 2.0 Exhaust are prominently displayed, emphasizing the bike's power and performance. The 56mm Stainless Steel Footpegs and Waterproof Electronics add to its premium build quality. This image is perfect for riders seeking a reliable, race-ready pit bike for off-road adventures.
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2025 Thumpstar TSR 140

Thumpstar
SKU:
TSR140-C
$2,799.00 $2,369.00
$2,799.00
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Description

Thumpstar TSR 140-C (V5 Model)

The Thumpstar TSR 140-C is the ultimate pit bike, meticulously redesigned for 2025 as the Version 5 (V5) model. This bike is a testament to Thumpstar's commitment to innovation, durability, and performance. Built from the ground up, the TSR 140-C is engineered to tackle the challenges of off-road riding, offering riders an unparalleled experience with its cutting-edge features, robust construction, and race-ready design. Whether you're a seasoned rider or a beginner, this bike delivers power, precision, and reliability like no other.

Key Features of the Thumpstar TSR 140-C

1. Revolutionary Tri-Bar Chassis Frame

The Tri-Bar Frame is a game-changer in pit bike design. Built with advanced strengthening techniques, this frame offers superior rigidity and agility, ensuring the bike feels solid and responsive underfoot. Key enhancements include:

  • Re-routed Header Pipe: Reduces the risk of pipe burns by running the exhaust under the frame.

  • Removable Footpeg Mounts: Allows easy replacement and removal of the kickstand for racing.

  • Adjustable Steering Stop: Provides customizable handling for different riding styles.

  • Airbox Compatibility: Designed to house Thumpstar's advanced caged airbox for improved airflow and filtration.

2. AK7 Wheels: Strength Meets Style

The AK7 Wheels have been completely redesigned for durability and performance:

  • 20mm Hollow Rear Axle: Heat-treated for strength while maintaining a lightweight design.

  • Stainless Steel Spokes: Anti-stretch and snap-resistant for long-lasting reliability.

  • 7075 Alloy Rims: Top-of-the-line aluminum alloy rims for maximum strength and reduced weight.

  • 6-Bolt Sprocket & 4-Bolt Disc: Enhanced hub design for better power transfer and braking performance.

3. VS1 Suspension System

The VS1 Suspension ensures a smooth and controlled ride, whether you're hitting jumps or navigating rough terrain:

  • VS1 Front Forks: Improved outer tubes and valving provide plush yet stable handling, with excellent feedback for precise control.

  • VS1 Linkage Rear Shock: Scaled-down from full-size race bikes, this linkage system offers superior rear suspension performance, improving cornering, high-speed stability, and rider comfort.

4. YX-R 140 Engine: Power and Reliability

At the heart of the TSR 140-C is the YX-R 140 Engine, delivering 11+ HP at the crank:

  • 4-Stroke Manual Transmission: Smooth and reliable 4-speed gearbox (N1234) for precise control.

  • Molkt VM22 26mm Carburetor: Optimized for performance and fuel efficiency.

  • Pipe Bomb 2.0 Exhaust System: Enhances low-end torque and top-end power with improved exhaust flow.

5. Advanced Airbox Design

The Thumpstar Airbox is a standout feature, offering:

  • Dual-Layer Air Filter: Provides superior filtration, protecting the engine from harmful particles.

  • Increased Airflow: Enhances engine performance and horsepower.

  • 3D-Modeled Design: Precision-engineered for a perfect fit and optimal functionality.

6. Waterproof Electronics

The TSR 140-C is equipped with a redesigned electrical system:

  • Heavy-Duty Wiring: Multi-core wiring and sturdy connectors for durability.

  • Waterproof Components: Includes Revking CDI, Rectifier, and Coil for reliable performance in all conditions.

7. Ergonomic and Durable Components

  • 56mm Stainless Steel Footpegs: Wider for better grip and rider comfort, made from high-quality stainless steel for long-lasting durability.

  • 220mm Front & 190mm Rear Disc Brakes: HSK dual-piston (front) and single-piston (rear) brakes for exceptional stopping power.

  • 3.4L Fuel Tank: Compact yet efficient for extended riding sessions.

Technical Specifications

  • Engine: YX 140cc, 4-Stroke

  • Gearbox: Manual, 4-Speed (N1234)

  • Carburetor: Molkt VM22 26mm

  • Exhaust: Pipe Bomb DW-1, 38mm

  • Suspension: VS1 Inverted Forks (Front), VS1 Linkage Rear Shock

  • Brakes: 220mm Front Disc, 190mm Rear Disc

  • Wheels: 7075 Alloy Rims (Front: 70/100-14, Rear: 80/100-12)

  • Weight: 80kg (Net), 90kg (Gross)

  • Seat Height: 880mm (35")

  • Top Speed: 90kph (55mph)

Assembly
Troubleshooting
Service
Brochure
Engine Parts List
Parts Breakdown List
Instruction Manual
Suspension / Wheel
Graphic Template
 

The TSR140-C has received a complete overhaul for Version 5. Gone are the days of facing struggles of dealing with issues which are common on many other minibikes. We have gone back to the drawing board and scratch built a New Frame, Airbox, Linkage Suspension, Hubs and Rims, and much more. This has not only allowed our bikes to become stronger and more reliable, but also gives the rider peace of mind knowing, no detail has been left untouched.

Our design team has produced a piece of engineering art. The frames are a new Quad Bar, which has made them stronger than ever. Along with the frame developments, we made space and rigged them with mounts to accommodate our new caged airboxes. This allows a better air filtration system while increasing airflow into the carburetor, and in turn, more horsepower. A first on pit bikes and minibikes alike, we have scaled down the linkage from the likes of a full-size race bike and fitted it to these smaller sized 110s. The linkage provides a much smoother ride than traditional PDS style suspension, which allows for faster cornering, high and low-speed adjustments, and increased rider comfort. We have redesigned our hubs and created space for a much heavier duty 20mm rear axle, coupled with stainless spokes and alloy rims, which provide our strongest wheels to date. Check out our description video and the following spec lists to see these upgrades!

Latest V5 Model

Frame

Thumpstar Tri-Bar Chassis

With developments in chassis strengthening and design, Thumpstar's new Tri-Bar Frame allows the bike to feel more solid under foot while allowing the bike to perform with greater agility and comfort than ever before. Additions to the frame allow the header pipe to be re-routed under the frame, reducing the likeliness of pipe burns to the legs, include removable footpeg mounts, which can be easily replaced and allow the kickstand to be removed for racing, and a reinforced adjustable steering stop. The new frame is also capable of housing the new Thumpstar airbox, but it is not yet a stock option.

 

 

 

Wheels

AK7 Wheels

We’ve redesigned and strengthened our AK7 wheels to give you the comfort of knowing buckled rims and loose spokes are a thing of the past. The cast aluminum hub has been changed to run a 6-bolt sprocket and 4-bolt disc while moving to a 20mm axle that allows for oversized wheel bearings. We’ve swapped those stretch-prone steel spokes for anti-stretch and snap-resistant stainless spokes. And lastly, the rims have been upgraded to top-of-the-line aluminum alloy.

Suspension

VS1 Front Forks

Our new line of VS1 front forks provides a plush yet stable ride through all those bumps, ruts, and jumps. Improved outers coupled with our reliable valving lets the front end have a settled movement while allowing greater front wheel feedback, keeping the fork to be rigid while handling bigger impacts.

Header

Pipe Bomb 2.0 head pipe

A redesigned frame came with requirements for a new exhaust header. The new Pipe Bomb 2.0 head pipe from Thumpstar allows exhaust gasses to expand, cool, and ramp back up at a higher velocity when exiting. This results in a greater bottom and low-end response while keeping the tuning in check for the top end.

Linkage

Swingarm and Linkage developments

The new TSX bikes have received yet another significant upgrade, which brings performance closer to that of full-size motorcycles, rear linkage. Rather than traditionally attaching the shock to the top of the swingarm, we have scaled and applied linkage shared with the likes of full-size race bikes to attach to the bottom of the swingarm. This improves handling in the rear and completely changes the riding experience of these bikes.

Engine

YX-R 140 Engine

Giving you the thump you need to get off the line and the punch that gets you out of the gate, the YX140 engine delivers a whopping 11+ HP at the crank. Precision engineering from Yin Xiang delivers a reliable and strong engine package that consistently gets the job done.

Airbox

 

One of our most exciting developments for 2020 was the design and production of our very own airboxes for the TSX and the TSB. Advances in 3D modeling and printing have allowed us to give you a system that provides much better air filtration with a dual-layer filter, while increasing airflow to the engine. The airbox prevents harmful particles from entering your engine where traditional minibike foam filters would typically fail.

Waterproof Electronics

 

All of our new bikes come equipped with redesigned looms and electronics. We have done away with single flimsy wires and connectors and replaced them with heavy-duty multi-core wiring and sturdy connectors. Accompanied by waterproof plugs and electronics such as the Revking CDI, Rectifier, and Coil, makes this is a far superior package to any of the competition.

Rear Axle

 

We have increased our rear axle to 20mm and made it hollow, then heat treated it, which makes it a similar weight to the 15mm axle but much stronger. Finally, made it a Lockheed design so only need one 30mm spanner for removal.

Footpegs

 

Our new footpegs have been made 56mm wide, the same as aftermarket motocross 250/450 footpegs, for better grip and rider comfort. We used high-quality stainless steel material for strength and to look fresh for years to come, finished off with perfectly fitting springs.

Brands

TSR140 Brands

Product Packaging

Pitbike Assembly & Servicing

Specifications

ENGINE & TRANSMISSION
Engine YX | 4 Stroke
CC Rating 140cc
Gearbox Manual | 4 speed (N1234)
Starter Kick
Carburetion Molkt VM22 26mm
Exhaust Pipe Bomb DW-1 | 38mm Exhaust System
Final Drive PSC 6 Bolt Sprocket | 428 HD Chain
Top Speed 90kph / 55mph (depending on gearing)
 
SUSPENSION, BRAKES, & WHEELS
Suspension Front VS1 Inverted Forks | Length 770mm | 45 / 48mm
Suspension Rear VS1 Linkage U Shock | Length Adj 350mm (+10mm)
Brakes Front 220mm Disc | HSK Dual Piston
Brakes Rear 190mm Disc | HSK Single Piston
Wheel & Tire Front 7075 Alloy Rim | 70/100-14
Wheel & Tire Rear 7075 Alloy Rim w/ Rim Lock | 80 / 100-12
 
DIMENSIONS & WEIGHT
Wheelbase (axle to axle) 1260mm | 50"
Seat Height 880mm | 35"
Product Weight N.W | G.W 80 / 90 kg | 176 / 198 lbs.
Tank Capacity 3.4 Liters | 0.9 Gallon
Product Packing Size 1420 x 430 x 640mm | 0.40m3
download brochurewhy thumpstarFrequently Asked QuestionThumpstar Testimonial
 
 
 

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