Upgrade your small off-road vehicle with this 140cc 4-stroke semi-auto engine motor kit, designed for Go Karts, ATVs, quads, buggies, and mini tricycles. This high-performance engine delivers 7KW of power at 8500 RPM and 9.5 N·m torque at 5500 RPM, providing reliable acceleration, climbing capability, and smooth riding performance.
The 3-speed gearbox with reverse combined with a semi-auto centrifugal clutch makes it beginner-friendly while still giving experienced riders excellent control and versatility. The kit includes all essential components for installation: gear shift lever, manifold set, engine cover, wiring harness, 26mm carburetor, air filter, throttle grips with cable, and brake lever with cable.
With dual start options (electric and kick start), this engine is convenient in any situation. Its wide compatibility makes it perfect for upgrading older 70cc-125cc engines or replacing worn-out motors in Taotao, Coolster, Kazuma, Roketa, ATC70, TRX90, and Fourtrax 70 models.

Engine Type: Single Cylinder, Horizontal, 4-Stroke, Air-Cooled
Displacement: 140cc
Bore × Stroke: 56mm × 57mm
Max Power: 7KW @ 8500 RPM
Max Torque: 9.5 N·m @ 5500 RPM
Min Idle Speed: 1500±150 RPM
Start Mode: Electric Start (upper position) + Kick Start
Clutch Type: Semi-Auto Centrifugal Clutch
Transmission: 3-Speed + Reverse
Sprocket: 14T, 428 Chain, 17mm Shaft
Valve Clearance: 0.05±0.02mm
Primary Ratio: 3.722
Transmission Ratio: 3.822
Gear Ratios: 1st: 3.272, 2nd: 1.937, 3rd: 1.350, Reverse: 1.043
Engine Oil Capacity: 900ml (15W/40W-SE, 4-Stroke)
Stroke Volume: 140ml