Description

BRZ 140cc Racing Pro Manual Dirt Bike – 140cc 4‑Stroke 17/14 Clutch

Welcome to pro dirt bike racing. The BRZ 140cc Racing Pro Manual Dirt Bike is the upgraded big‑bore version of BRZ’s popular Racing Pro line, swapping the 125cc for a 140cc 4‑stroke engine for noticeably more power, torque and top end. With a manual 4‑speed clutch gearbox (N‑1‑2‑3‑4) and a 17″/14″ big‑wheel setup, the Racing Pro 140 is built for riders stepping up from a 125 or smaller pit bike who want a serious, competitive machine for tracks, fields and private trails.

The 140cc engine is a high‑output, air‑cooled 4‑stroke that delivers strong low‑end torque and a punchy top end, giving you more acceleration and a higher top speed than a 125 while still being manageable for riders progressing from smaller bikes. The manual clutch lets you use your left hand for the clutch and left foot for shifting, exactly like a full‑size motocross bike, so it’s perfect for learning proper clutch control and building real off‑road skills.

The 17″/14″ big‑wheel configuration (17″ front, 14″ rear) gives the Racing Pro 140 much better stability, cornering and obstacle rollover than smaller 14″/12″ or 12″/10″ pit bikes. This makes it ideal for older teens and adults, offering more legroom and a more “full‑bike” feel while still being lighter and easier to manage than a full‑size 250 or 450.

The BRZ Racing Pro chassis is engineered for performance and durability, with motocross‑inspired geometry, long‑travel front forks and a mono‑shock rear for absorbing bumps and landings. Front and rear disc brakes provide confident stopping power, and the bike is designed to be tough enough for regular weekend riding and practice days.

If you’re a rider who wants more power and speed than a 125cc with a proper manual clutch, big‑wheel stability and a race‑ready chassis, the BRZ 140cc Racing Pro Manual Dirt Bike is a strong, affordable choice for your lineup at madtrailsurrons.com.

Detailed specs

Engine & drivetrain

• Engine type: 140cc 4‑stroke single‑cylinder petrol engine, air‑cooled.

• Cooling: Air‑cooled, simple and reliable for off‑road use.

• Carburettor: Carburetted fuel delivery (often similar to YX/Zongshen 140 engines); some builds offer performance upgrades like Mikuni carbs.

• Gearbox: 4‑speed manual transmission with hand clutch (1‑down, 3‑up pattern typical).

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

• Start: Kick start (standard for this class; some variants may include electric start).

• Fuel: Unleaded petrol.

• Exhaust: Performance‑style exhaust; owners often upgrade to aftermarket systems for more power and sound.

Chassis, wheels & ergonomics

• Frame: Junior/adult‑sized dirt bike frame with motocross‑style geometry.

• Wheel size: 17″ front / 14″ rear big‑wheel configuration.

• Tyres: Off‑road knobbly tyres for dirt, grass and light mud.

• Seat: Tall motocross‑style seat; many Racing Pro bikes are shown with tall race seats for extra comfort and legroom.

• Rider size: Suited to older teens and adults; marketed as a junior/adult bike.

Suspension & brakes

• Front suspension: Long‑travel front forks suitable for jumps and rough terrain.

• Rear suspension: Mono‑shock rear for absorbing bumps, whoops and landings.

• Brakes: Front and rear disc brakes for strong stopping power on dirt.

Performance & durability

• Power: 140cc 4‑stroke racing‑tuned engine for more power and torque than a 125cc.

• Top speed: Typical 140cc 17/14 bikes reach around 50–60 mph (80–96 km/h) depending on gearing, rider weight and conditions.

• Chain & sprockets: Many Racing Pro builds show upgraded chains (e.g., 428) and performance sprockets for durability.

• Protection: Often fitted with aluminium skid plates and reinforced footpegs for off‑road abuse.

Use case & setup

• Intended use: Off‑road only—fields, trails, MX practice tracks and private land (not road legal).

• Rider profile: Teens and adults who have outgrown 110/125cc bikes and want more power with a proper clutch.

• Assembly: Supplied part‑built; final assembly includes front wheel, handlebars, plastics, controls and stand, plus thorough nut‑and‑bolt checks before riding.

• Pre‑ride checks: Fuel tap operation, cable routing, brake function and fastener torque should all be verified before first ride.