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Feature: High-flow Oil Pump: Reduces the wear of friction pairs and prolongs the engine service life. Aluminum Cylinder Head Body: Improves the heat dissipation capability cuts the weight and increases the torque of the engine. Lubricating Oil Strainer: Helps removing solid contamination from lubricating oil largely reducing the wear of friction pairs and prolonging the engine service life. Crank Shaft: The engine is low speed with high torque and has large diameter bearings for crankshaft connecting rod increasing the reliability of the bearings. CVT: CVT consist mainly of 2 transmission pulleys and 2 transmission belts. It’s compact simple design offers seamless shifting between an unlimited amount of varying gear ratios allowing a smooth rate of acceleration. Forced Air-cooled Engine: There are metal fins covering the outside of the cylinders and the heat generated by the engine is released directly into the air when the cooling fan blows air over fins. It has the advantages of simple structure light weight wide adaptability to climate change rapid start up and no need of radiator. Specification: Engine Type: GY6 Single Cylinder 4-Stroke Cooling: Air Cooled Displacement: 150cc Max power kw/r/min: 6kw/7500r/min Rated power kw/r/min: 5.2kw/7000r/min Max torque n.m/r/min: 7.6N.m/6500r/min Piston diameter:57.4mm Piston stroke: 57.8mm Compression ratio: 9.2:1 Ignition system: CDI Transmission: CVT Start method: Electric/Kick Fitment: Compatible with both 125cc and 150cc engine size scooters and vehicles. GY6 125cc and 150cc motors come in different sizes. The difference is in the length of the rear swing arm. Package Included: 1x Complete Engine Notice:Add engine oil before use!