Lifan Complete 125cc 4-Stroke Engine Motor Kit, Pit Dirt Bike Engine Kit, Manual Clutch, Kick Start Motor for ATC70 CT70 CT90 CT110 CRF 50 XR50 XR70 Taotao DB17 CRF110 CRF70 Z50R ST90

This 125cc 4-stroke single-cylinder horizontal engine assembly is engineered for riders and builders who need dependable power, simple maintenance, and broad frame compatibility in pit dirt bike and mini motorcycle platforms.With a bore and stroke of 52.4mm × 55.5mm and total displacement of 119.7cc, the engine delivers 6.5kW at 7500RPM and 8.0N·m of torque at 5000RPM, providing responsive acceleration and strong mid-range pulling power. The manual wet clutch paired with a 4-speed gearbox (4-up shift pattern) allows smooth gear engagement and consistent control.The air-cooled structure improves heat dissipation and long-term durability, while the kick start system ensures reliable starting in outdoor riding environments. A factory-installed 15-tooth front sprocket compatible with 428 chain delivers efficient drivetrain transfer.This complete package includes:LIFAN 125CC 1P52FMI engine, carburetor, wiring harness, air filter, intake manifold set, clutch lever and cable, twist throttle grips with cable, exhaust pipe, kick starter lever, gear shift lever, 428 chain (106 links), and 41T rear sprocket.Engine dimensions: 470 × 275 × 280mm Weight: 21kgFits many mini frames including:CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Monkey / ST70 / QA50 / QR50 / CL70 / SL70 / CS90 / ZB50 and similar models.⚠️ If unsure about compatibility, please measure your frame mounting bolt distance — approximately 154mm (6 inches).

• Powerful 125cc 4-Stroke Performance 119.7cc single-cylinder horizontal engine delivers up to 6.5kW at 7500RPM and 8.0N·m torque at 5000RPM, providing strong low-end pull and reliable power output for pit dirt bike and mini motorcycle applications.
• 4-Speed Manual Wet Clutch Transmission Equipped with a 4-speed manual clutch gearbox (4-up shifting) for smooth gear engagement, improved riding control, and enhanced durability during aggressive riding or trail use.
• Air-Cooled Kick Start Design Air-cooled structure improves thermal stability and long-term reliability. Simple kick start system ensures easy starting without electrical complexity, ideal for off-road and recreational riding.
• Complete Installation Kit Included Includes engine, carburetor, wiring harness, air filter, intake manifold set, clutch lever, clutch cable, twist throttle with cable, exhaust pipe, kick starter lever, gear shift lever, 428 chain and 41T sprocket, minimizing additional purchases and installation time.
• Universal Mounting for Popular Mini Frames Designed for common pit bike frames including CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / CT90/CT110/ CS 90 / SL 90 / ZB 50 /, SSR, Apollo, Coolster, TaoTao DB14 DB17 and similar models. Mounting bolt spacing approx. 154mm (6 inch) — please verify before purchase.