125cc 4 Stroke Manual Clutch Engine Motor Horizontal Single Cylinder Air Cooled Kick Start 4 Speed with 15T 428 Sprocket for Pit Dirt Bike CRF50 XR50 CT70 Z50 SSR110 TaoTao DB14 Apollo RFZ 125

This 125cc 4-stroke manual clutch gas engine motor is designed for riders seeking more control, stronger power delivery, and performance upgrades for pit bikes and mini trail motorcycles. Featuring a horizontal single-cylinder layout, this engine produces up to 6.5KW at 7500RPM, delivering responsive acceleration and smooth power throughout the RPM range.The wet manual clutch with 4-speed transmission allows precise shifting and throttle modulation, making it ideal for aggressive riding styles, track use, or custom builds. The kick start system ensures reliable starting even in harsh riding environments.With an efficient air-cooled design, low fuel consumption, and durable internal components, this engine offers long-term reliability and easy maintenance. The included 15-tooth 428 sprocket supports strong torque transfer and drivetrain compatibility.Whether you're replacing a worn engine or upgrading your pit bike project, this motor delivers dependable performance and excellent fitment across many popular mini bike platforms.🔧 SpecificationsEngine Type: Single Cylinder, Horizontal, 4-Stroke, Air CooledDisplacement: 119.7ccBore x Stroke: 52.4mm x 55.5mmMax Power: 6.5KW / 7500RPMMax Torque: 8.0N·m / 5000RPMClutch: Manual Wet ClutchTransmission: 4 Speed Manual (4 Up)Starting System: Kick StartCompression Ratio: 9.0:1Fuel Consumption: <367g/KW.hSprocket: 15T, 428 ChainEngine Oil Capacity: 900ml (15W/40-SE, 4-Stroke Oil)📦 Package Includes1 × 125CC Engine1 × Kick Starter Lever1 × Gear Shift Lever1 × Intake Manifold Set1 × Engine Cover🚗 Fitment (Verify Mounting Bolt Distance: 154mm / 6")Compatible with: CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Monkey / XL70 / ST70 / QA50 / QR50 / CL70 / SL70 / Passport 70 / CS90 / SL90 / ZB50 and similar pit bike frames.

• High Output 125cc Performance Engine Single-cylinder horizontal 4-stroke engine delivers up to 6.5KW @ 7500RPM and 8.0N·m torque @ 5000RPM, providing stronger acceleration and higher top-end performance for pit bikes and mini motorcycles.
• True Manual Clutch – Full Rider Control Equipped with a wet multi-plate manual clutch and 4-speed transmission (4 Up pattern) for precise throttle response and gear control — ideal for experienced riders and performance builds.
• Reliable Kick Start System Simple and dependable kick start ignition design reduces electrical dependency and improves reliability for off-road riding and outdoor environments.
• Durable Air-Cooled Horizontal Design Efficient air cooling keeps operating temperatures stable. Compact horizontal layout allows easy installation and compatibility with most pit bike frames.
• 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.