4 Stroke Engine, Semi Automatic (3 forward 1 reverse gear), electric start, single cylinder Front sprocket: 420 – 17mm – 14T, Lgnition Method: CDI Top Engine Mount: 3.62″, Bottom Engine Mount: 3.23″, Bolt to Bolt: 5.98″, Bore x Stroke: 2.06″ x 2.19″ Max Torque & Rotating Speed: 8.5 N.m/5000r/min 250 r/min Suitable for ATV UTV 4 wheelers quad bikes Specifications:Displacement: 125ccType: Horizontal, single-cylinder, 4-stroke, air-cooledCompression ratio: 9.0: 1Front sprocket 420 – 17mm – 14TTransmission: 4-speed 3 forward 1 reverse gearBore x Stroke: 2.06″ x 2.19 (52.4mm x 55.5mm)Top Engine Mount : 92mmBottom Engine Mount: 82mmBolt to Bolt :152mm (6″)Rated Power Rotating Speed: 5.8 kw/7500r/min 375 r/minMax. Torque Rotating Speed: 8.5 N.m/5000r/min 250 r/minIdle speed 1500 r/min 100r/minIgnition: CDI Wiring:1. Five wires (Plug): For gear indicator2. Yellow wire: For storage battery3. Pink (or Yellow) wire: For storage battery4. Black Red wire: For signal trigger5. Green wire: For grounding6. Blue White: For trigger coil