Complete Kit 140CC Racing Engine 4 Stroke Motor Kit with Wiring Harness Carburetor Kit for Dirt Pit Bike XR50 CRF50 XR CRF 50 70 CT70 YX140 DTE140 Z50R CT90 CT110 Apollo RFZ125 Coolster Taotao

Upgrade your pit or mini dirt bike with this 140cc 4-stroke single-cylinder engine, designed for riders seeking reliable performance, smooth gear shifting, and versatile starting options.The engine produces 7KW of power at 8500RPM and 9.5N·m torque at 5500RPM, ensuring strong acceleration, climbing ability, and consistent off-road performance.Featuring a manual wet clutch with 4-speed gearbox (01234), the motor provides smooth and precise gear transitions, while electric and kick start options ensure easy starting in any situation.The complete installation kit includes kick starter lever, gear shift lever, manifold set, engine cover, wiring harness, carburetor, air filter, clutch lever & cable, twist throttle with cable, and exhaust pipe with muffler, making it convenient to replace or upgrade your dirt bike engine.Compatible with a wide range of mini and pit bike models: CRF50, CRF70, XR50, XR70, Z50, Z50R, CT70 Mini Trail, Z50 Minitrail, Monkey Bikes, XL70, SSR 110, RFZ 125, TaoTao DB14/DB17.🔧 Technical SpecificationsEngine Type: Single Cylinder, Horizontal, 4-Stroke, Air-CooledDisplacement: 140ccBore × Stroke: 56mm × 57mmMax Power: 7KW @ 8500RPMMax Torque: 9.5N·m @ 5500RPMIdle Speed: 1500±150 RPMCompression Ratio: 8.8:1Start Mode: Electric Start (Lower Position) + Kick StartClutch Type: Manual Wet ClutchTransmission: 4-Speed 01234Front Sprocket: 15T, 428 Chain, 17mm ShaftValve Clearance: 0.05±0.02mmPrimary Ratio: 3.722Transmission Ratio: 3.822Gear Ratios: 1st: 3.272, 2nd: 1.937, 3rd: 1.350, 4th: 1.043Engine Oil Capacity: 900ml (15W/40W-SE, 4-Stroke)Dimensions: 470 × 275 × 280mmWeight: 23kg

• Powerful 140cc 4-Stroke Engine Single-cylinder, horizontal 4-stroke motor delivers 7KW @ 8500RPM and 9.5N·m torque @ 5500RPM, providing reliable acceleration and strong performance for pit dirt bike replacement or upgrades.
• Dual Electric & Kick Start Equipped with electric start (lower position) and kick start, offering convenient, reliable starting in all conditions.
• Manual Clutch with 4-Speed Gearbox Includes manual wet clutch and 4-speed transmission (01234) for smooth gear transitions, responsive throttle control, and precise handling.
• Complete Installation Kit Included Package includes kick starter lever, gear shift lever, manifold set, engine cover, wiring harness, carburetor, air filter, clutch lever & cable, twist throttle with cable, and exhaust pipe with muffler for easy installation.
• 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.