Description

DEMON X DXR 140 Pit Bike – 140cc YX140 Race Tuned 14/12 electric dirt bike

The DEMON X DXR 140 Pit Bike is the upgraded big‑bore version of the popular Demon X pit bike line, switching from 110cc to a race‑tuned YX140cc 4‑stroke engine for significantly more power than the normal electric dirt bike, torque and top end. With a dyno‑tested, race‑engine setup and a manual 4‑speed clutch gearbox (N‑1‑2‑3‑4), the DXR 140 is built for riders who want to learn proper motocross clutch work and have a serious, competitive pit bike for tracks, jumps and fields.

The DXR 140 sits in a larger frame than traditional 110s, giving taller riders more legroom and a more grown‑up feel while still keeping the compact stance of a pit bike. It uses a 14″/12″ wheelset (14″ front, 12″ rear) with off‑road tyres, so you get better rollover, cornering and stability than smaller 12/10 bikes, and a more confident ride on berms, jumps and loose terrain.

Power is the standout. The YX140cc engine is described as a 12 hp dyno and race‑tested engine, with features like:

• 26mm Molk Race carb for strong throttle response.

• 2‑stage race foam air filter for clean airflow and good protection.

• Big valve, high lift cam for improved power over a stock 110cc.

• Race CDI and gearbox tuned for performance use.

• Often fitted with a big‑bore exhaust system for a louder, more aggressive “big bike” sound.

The manual clutch gearbox means you’ll use your left hand for the clutch and left foot for shifting, exactly like a full‑size motocross bike. This is perfect for riders learning to ride properly, practicing clutch control, and building skills for larger bikes later.

The DXR 140 features TTR‑style plastics for a clean, motocross look, a chromolly double‑tubed cradle frame with powder‑coated finish, and professional front forks and rear shock for off‑road handling. It’s built to be lightweight, durable and easy on the track, while handling the power of a race‑tuned engine. Electric dirt bike

If you’re a rider who wants more power and speed than a 110cc pit bike, with a proper manual clutch, race‑tuned engine and a larger, adult‑friendly frame, the DEMON X DXR 140 Pit Bike is a strong, competitive choice for madtrailsurrons.com.

Detailed specs

Engine & drivetrain

• Engine type: YX140cc 4‑stroke single‑cylinder petrol engine (race‑tuned).

• Power: 12 hp (dyno & race tested) at the rear wheel in stock form.

• Carburettor: 26mm Molk Race carb.

• Air filter: 2‑stage race foam air filter (red on XLR2 variant).

• Cooling: Air‑cooled.

• Gearbox: 4‑speed manual clutch (N‑1‑2‑3‑4 pattern).

• Clutch: Manual hand clutch (left hand), like a full motocross bike.

• Exhaust: Includes big‑bore exhaust system for a louder “big bike” sound and improved power delivery.

• Starting: Kick start (standard for this class).

• Engine tuning: Dyno tested, race‑tuned by WPB for performance use.

• Race CDI: Race CDI for high‑performance timing and power curve.

Chassis, wheels & ergonomics

• Frame: TTR‑style plastics; chromolly double‑tubed cradle frame with powder‑coated finish.

• Engine support: Built on the only and exclusive WPB Stomp/DemonX 140‑class frame mid‑range that is race‑tested and dyno proven to handle the power of race‑tuned engines.

• Wheels: 14″ front / 12″ rear off‑road spoked wheels.

• Tyres: Off‑road knobbly tyres for 14/12 wheels.

• Seat height & size: Larger frame than traditional 110 pit bikes, better suited to teens and adults; 14/12 wheel combo for better rollover and stability than smaller 12/10 bikes.

Suspension & brakes

• Front suspension: Hydraulic front forks suited to light‑to‑moderate off‑road and track use.

• Rear suspension: Mono‑shock rear, often adjustable for preload on comparable models; professional suspension built for off‑road handling.

• Brakes: Front and rear disc brakes for reliable stopping power in dirt.

Performance & weights

• Top speed: Typically around 45–55 mph on a stock 140cc pit bike with 14/12 wheels and race tuning; exact speed depends on tyres, gearing and rider weight.

• Rider suitability: Best for teens and adults looking to step up from a 110 to a more powerful, competitive 140.

• Intended use: Tracks, jumps, fields and mini‑moto venues; not road legal.