Stomp FXJ 110 Semi Automatic Pit Bike

Stomp FXJ 110 Semi-Automatic Pit Bike

110CC 4-STROKE. 4-SPEED SEMI-AUTOMATIC. NO CLUTCH LEVER. 14”/12” WHEELS. 🏁🔥

The Stomp FXJ 110 Semi is the perfect entry-level bike for field racers, back-yard thrashers and riders making the move onto a bigger petrol pit bike.

Simple to get to grips with but surprisingly capable, the semi-automatic 106.7cc YX110 4-stroke engine packs a serious punch while keeping gear changes straightforward.

Conceived and refined for fun, but capable of so much more, the FXJ features Stomp’s proven in-house geometry and access to special-edition engines built specifically for Stomp.

For 2026, the FXJ gets a fresh round of upgrades, including new grips, titanium-colour front and rear brakes, titanium-colour wheel hubs, a titanium-finish engine bottom support and new black spokes and nipples for a sharper factory look.

Built using quality components, robot welding, dedicated test tracks and highly trained staff, the FXJ is designed to deliver the proper Stomp riding experience.

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⚡ Key Features

• 🔥 106.7cc YX110 4-stroke engine
• ⚙️ 4-speed semi-automatic gearbox
• 🕹️ No manual clutch lever required
• 🔄 N-1-2-3-4 gear pattern
• 💪 5.1kW @ 8,000rpm
• 💥 7.2Nm @ 5,000rpm
• 💨 19mm carburettor
• 🔑 Kick start
• ⚡ CDI ignition
• 💦 Wet 3-disc clutch
• 💥 630mm conventional front forks
• 💥 270mm adjustable-preload rear shock
• 🛑 Hydraulic front & rear disc brakes
• 🛞 14” front / 12” rear
• 🏁 60/100-14 front tyre
• 🏁 80/100-12 rear tyre
• 🏗️ Lightweight steel spine frame
• 💪 390mm steel swingarm
• 🏁 Lightweight steel handlebars
• 💥 28mm big-bore exhaust
• 📏 Approx. 740mm seat height
• 📏 Approx. 275mm ground clearance
• ⚖️ Approx. 60kg dry weight
• ⛽ 3.5L fuel tank

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🔥 106.7cc YX110 4-Stroke Engine

At the heart of the FXJ is the proven YX110 4-stroke engine, with a displacement of 106.7cc.

Stomp lists maximum power at:

5.1kW @ 8,000rpm

and maximum torque at:

7.2Nm @ 5,000rpm

The engine is air-cooled and uses a 19mm carburettor, keeping the mechanical package straightforward and easy to maintain.

The YX110 has become a well-established engine platform in the pit-bike world, and Stomp’s FXJ uses a version specifically selected for its own bikes.

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⚙️ 4-Speed Semi-Automatic Gearbox

This is where the FXJ Semi differs from the manual version.

The FXJ uses a 4-speed semi-automatic gearbox:

N → 1 → 2 → 3 → 4

The rider changes gear using the foot lever, while the semi-automatic clutch system removes the need for a traditional clutch lever.

That makes the FXJ an excellent bike for riders wanting to learn how gears work without having to master clutch control at the same time.

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🕹️ Learn How To Ride Gears

If a rider has already mastered an automatic bike, the FXJ Semi provides a natural next step.

They can learn how to:

• Select the correct gear
• Change up through the gears
• Understand how gearing affects acceleration
• Match the gear to the terrain
• Manage throttle input smoothly
• Develop confidence on a geared bike

It gives riders the fundamentals of riding a geared motorcycle while keeping the operation simpler than a full manual bike.

For riders who want to progress onto full clutch control, the Stomp FXJ 110 Manual provides the next step.

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🔑 Traditional Kick Start

The FXJ uses a kick-start system, keeping the bike mechanically simple.

There’s no electric starter system to rely on, giving the FXJ that traditional pit-bike character.

The ignition system uses CDI, with the air-cooled 4-stroke engine designed around straightforward maintenance.

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💥 630mm Conventional Front Forks

The front suspension uses 630mm non-USD conventional forks.

The forks are designed around the FXJ’s compact chassis and are suitable for the bumps and uneven surfaces encountered during appropriate off-road riding.

Their conventional design also keeps the suspension setup relatively simple and straightforward to maintain.

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🔧 Adjustable Rear Shock

At the rear is a 270mm shock with adjustable preload.

The preload adjustment allows the rear suspension to be set according to rider weight and riding conditions.

The FXJ also uses a 390mm steel swingarm, giving the compact pit-bike chassis a solid platform.

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🛑 Hydraulic Disc Brakes

The FXJ comes equipped with hydraulic disc brakes front and rear.

Front

190mm hydraulic disc

Rear

180mm hydraulic disc

For 2026, the FXJ also receives titanium-colour front and rear brake components, adding to the updated factory styling.

As always, brakes should be checked before riding and maintained regularly.

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🛞 14”/12” Pit Bike Wheels

The FXJ uses the classic 14” front / 12” rear pit-bike wheel combination.

The wheels use steel rims with SDG hubs, with the 2026 model receiving new black spokes and nipples.

This keeps the overall bike compact while providing the ground clearance and riding position you’d expect from a proper pit bike.

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🏗️ Lightweight Steel Spine Frame

The FXJ is built around a lightweight steel spine frame.

Combined with the 390mm steel swingarm and approximately 60kg dry weight, the compact chassis is designed to keep the bike manageable and playful.

The lightweight steel handlebars and steel footpegs keep the setup simple and durable, while the bike’s proven Stomp geometry provides the foundation for its handling.

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💥 28mm Big-Bore Exhaust

The FXJ is equipped with a 28mm big-bore exhaust system.

The exhaust forms part of the bike’s overall performance-focused specification while maintaining the compact proportions of the FXJ chassis.

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📏 Compact Pit Bike Dimensions

The FXJ has an approximate:

Seat height: 740mm
Ground clearance: 275mm
Wheelbase: 1,085mm
Dry weight: 60kg
Fuel capacity: 3.5L

The 740mm seat height makes rider fit particularly important, especially for younger riders progressing onto a 110cc pit bike.

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👤 Is The Stomp FXJ 110 Semi-Automatic Right For You?

The FXJ Semi is a great choice for riders who want to learn how to ride a geared bike without jumping straight into manual clutch control.

Want something easier to ride?

An automatic pit bike keeps things simple with no gears or clutch operation.

Want to learn gears without a manual clutch?

That’s where the Stomp FXJ 110 Semi fits perfectly. It gives the rider a proper 4-speed gearbox while keeping clutch operation automatic.

Want full clutch control?

The Stomp FXJ 110 Manual adds a traditional wet multi-plate clutch and full manual gearbox control, allowing the rider to learn proper clutch operation.

Want more performance and a larger chassis?

The Stomp Z3-140 Big Wheel moves into a much more performance-focused 140cc platform with 17”/14” wheels.

For riders looking for even more engine capacity, we also stock larger 160cc and 250cc manual pit bikes.

If you’re unsure which bike is right for you, contact CMW Bikes before ordering and we’ll help you choose based on rider height, weight, experience and intended use.

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📦 What’s Included?

• Stomp FXJ 110 Semi-Automatic Pit Bike
• User/assembly documentation
• Assembly tools where supplied

Assembly Options

Boxed: Self assembly required

Fully assembled: Please select the fully assembled option at checkout where available.

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⚠️ Important Information – Off-Road Use

All vehicles supplied by CMW Bikes are intended for off-road/private-land use only unless specifically stated otherwise.

The FXJ is a mechanical petrol motorcycle and requires regular maintenance, inspection and correct setup.

Please ensure:

• Brakes, chain, tyres, bolts and controls are checked regularly
• Engine oil is checked and maintained correctly
• Appropriate protective equipment is worn
• The rider is suitably experienced for a semi-automatic 110cc dirt bike
• The bike is checked before every ride
• The vehicle is used responsibly and lawfully
• Permission is obtained from the landowner before riding on private land

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🛠️ Warranty Information

Petrol vehicles include a 30-day replacement parts warranty through CMW Bikes.

The warranty covers manufacturing faults only and does not cover normal wear and tear, misuse, accident damage or maintenance-related issues.

Warranty exclusions include:

• Chains, belts and split links
• Tyres, tubes and wheels
• Brake components
• Clutches and pull starts
• Fairings and bodywork
• Spark plugs and similar service items
• Other parts subject to normal wear and tear

Customers may be required to provide photographs/videos of faults and fit replacement parts themselves where appropriate.

Technical guidance can be provided.

Nothing in these terms affects your statutory rights under UK consumer law.

View our full Terms & Conditions:
CMW Bikes Terms & Conditions⁠

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🚚 Shipping & Collection

Multiple shipping options are displayed at checkout.

We always aim to dispatch orders as quickly as possible, although slight delays can occur during busy periods.

If you select fully assembled, this can add 1–2 business days during particularly busy periods.

Local delivery and collection options are available at checkout.

Some stock is held at our distribution centre and may need to be transferred to our Cardiff store before collection.

📞 Call 07745 557756 before ordering if you need to check local stock urgently.

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🏁 CMW Bikes

At CMW Bikes, we’re Cardiff’s local off-road dealer specialising in petrol and electric bikes, quads and scooters.

We stock a wide range of machines from Stomp, BRZ, KLF, Dazzle, Kayo, Revvi, VIPCOO and more, with options for younger riders, juniors and adults.

Whether you’re learning to ride gears for the first time, progressing from an automatic bike or looking for a compact semi-automatic pit bike, we’re here to help you find the right machine.

CMW Bikes – Cardiff’s local off-road dealer.