Parameters Engine displacement: 49cc, cylinder number: single cylinder, stroke: 2-stroke, chain: T8F, sprocket: 14 teeth, gas oil mixing ratio: 25:1 (gasoline: two-stroke engine oil), gearbox deceleration rate: 3.1:1, displacement: 49cc, spark plug size: L7T L7TC. High Performance 49CC two-stroke engine is equipped with high-performance cylinder head, plug, powder coated metal pulling device, air filter and 14mm carburetor, balance crank, balance flywheel, perforated piston window, upshift gear transmission device. Widely Used 49cc small motor air-cooled racing engine, which can achieve a speed of 40mph according to the user’s weight and terrain. It is widely applicable to 49CC 2-stroke mini bike, mini cross-country bike, ATV or scooter. Package Includes 1 * 49cc engine, 1 * fuel tank, 1 * accelerator cable, 1 * harness, 1 * handle, 1 * chain. Note Instructions are not included, and it is strongly recommended that professional personnel install. Be sure to use professional two-stroke