Lifan 140cc 4 Stroke Manual Clutch Engine Motor Complete Kit Single Cylinder Kick Start with Carburetor Wire for Pit Dirt Bike CRF50 XR50 Z50R CT70 Trail CT90 CRF70 Apollo RFZ 125 TaoTao YX140 DTE140

Upgrade your pit dirt bike with the Lifan 140cc oil-cooled manual clutch engine, engineered for riders seeking higher horsepower, improved thermal control, and long-term durability. The compact horizontal single-cylinder layout ensures easy frame compatibility while maintaining excellent balance and service accessibility.This engine delivers up to 8KW peak power and 9.5N·m of torque, offering faster acceleration and stronger climbing capability compared to standard small displacement engines. The integrated external oil cooling system improves heat management, keeping operating temperatures stable during extended riding and performance use.The manual clutch and N1234 4-speed transmission provide precise throttle modulation and smooth gear transitions, giving riders full control over power delivery and riding response.This package is designed as a complete engine replacement solution, supplying nearly all required installation components including intake system, exhaust system, drivetrain components, control cables, wiring, protection plate, and cooling hardware. Ideal for pit dirt bike restoration, frame builds, and performance upgrades.🔧 Technical SpecificationsEngine Type: Single Cylinder, Horizontal, 4-Stroke, Oil CooledDisplacement: 140ccBore × Stroke: 55mm × 59mmMax Power: 8KW @ 7500RPM (±375)Max Torque: 9.5N·m @ 5000RPM (±250)Clutch Type: Manual Wet ClutchTransmission: 4-Speed (N1234)Starting Method: Kick StartCompression Ratio: 9.0:1Engine Oil Capacity: 900ml (15W/40-SE, 4-Stroke)Front Sprocket: 15T, 428 ChainDimensions: 470 × 275 × 280mmFinish: Silver Cylinder Head / Black Cylinder / Steel Gray Crankcase📦 Package Includes1 × Lifan 140cc Engine1 × Kick Starter Lever1 × Gear Shift Lever1 × Intake Manifold Set1 × Carburetor1 × Air Filter1 × Wiring Harness1 × Kill Switch1 × External Oil Cooler1 × Exhaust Pipe & Muffler1 × 428 Chain1 × 428 41T Sprocket (76mm Bore)1 × Clutch Lever1 × Clutch Cable1 × Throttle Grips with Cable1 × Engine Skid Plate

• High Performance 140cc Power Output Upgraded single-cylinder horizontal 4-stroke engine delivers up to 8KW @ 7500RPM and 9.5N·m torque @ 5000RPM, providing stronger acceleration and higher top-end power than standard 125cc motors.
• Oil-Cooled Design for Stable Temperature Control Integrated oil cooling system improves heat dissipation, reduces thermal stress, and maintains consistent performance during extended riding or heavy load conditions.
• Manual Clutch with N1234 4-Speed Transmission Features a true manual wet clutch and 4-speed gearbox (Neutral + 1-2-3-4) for precise throttle control, smoother gear engagement, and improved rider responsiveness.
• Complete Ready-to-Install Engine Package Includes carburetor, air filter, wiring harness, kill switch, oil cooler, exhaust muffler, 428 chain, 41T sprocket, clutch lever & cable, throttle grips with cable, engine skid plate, intake manifold, kick starter and shifter — reduces installation time and extra parts cost.
• Wide Vehicle Compatibility 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.