Full Set Lifan 125cc Semi Auto 4-Stroke Engine Motor Kit with Wiring Harness Carburetor Chain Sprocket for Pit Dirt Bike CT70 CRF50 XR50 CRF70 XR70 ST70 Z50 50cc 70cc 90cc 110cc 125cc Mini Trail Bike

Upgrade your pit bike or mini trail bike with this full set Genuine Lifan 125cc Semi-Automatic 4-Stroke Engine Kit, a complete high-performance power solution built for riders who need stronger torque, smoother shifting, and reliable off-road performance. This horizontal racing engine delivers 5.8 kW at 7500 rpm and 8.5 N·m at 5000 rpm, making it an excellent replacement or performance upgrade for Honda-style 50cc–125cc motorcycles.Designed to fit many popular frames—including CRF50, CRF70, XR50, XR70, Z50, CT70, ST70, Monkey, XL70 and more—this kit eliminates guesswork by including every major installation component: PZ22 carburetor, manifold, air filter, wiring harness, throttle cable and grips, kick start lever, shift lever, exhaust pipe, 428 chain, and 41T sprocket.The semi-auto design with 4-up transmission (0-1-2-3-4) ensures smoother riding for beginners and experienced riders alike. Built with sturdy materials, efficient air-cooling, and CDI ignition, this engine is ready for demanding off-road use on dirt trails, tracks, and mini bikes.Whether you're rebuilding, upgrading, or creating a custom pit bike, this Lifan 125cc engine kit offers dependable performance, easy installation, and long-lasting durability.

Genuine Lifan 125cc Semi-Auto Engine – Authentic 4-stroke horizontal racing motor with electric & kick start, delivering 5.8 kW power and 8.5 N·m torque for strong acceleration on pit bikes and mini trail bikes.

Complete Installation Kit Included – Comes with PZ22 carburetor, air filter, manifold, wiring harness, throttle cable with grips, kick starter lever, shift lever, 428 chain, 41T sprocket, and exhaust pipe.

Fits Popular Honda-Style Frames – Compatible with CRF50, CRF70, XR50, XR70, Z50, CT70, ST70, XL70, Monkey, QA50, QR50, and most 50cc–125cc pit bike and mini trail bike platforms.

Semi-Automatic Transmission (4 Up) – Features 0-1-2-3-4 gearing, centrifugal clutch, CDI ignition, and reliable cooling for improved control and smooth shifting on dirt tracks and off-road trails.

Durable Racing-Grade Build Quality – Air-cooled 1-cylinder motor with 52.4×55.5mm bore and stroke, 9.0:1 compression ratio, 20mm shaft, and 428 chain setup designed for performance and longevity.