Features: The complete kit is designed for upgrading the regular bike to a motorized bike. Enable you to enjoy a fast and smooth riding journey, whose speed can be up to 38km/h. Super fuel-efficient, it will just consume 2.5 litre fuel per 100km. Heavy duty metal engine body for added durability, long service life. Fit for most type 26in and 28in bikes, such as mountain bikes, road bikes, cruisers, choppers. Come with all needed hardware for easy and convenient installation. Specification: Condition: Brand New Material: Aluminum alloy Color: Shown as picture Mode of Engine: Single cylinder, air-cooling, 2-stroke Bore & Stroke: 47mm & 40mm Rated Power: 2.5Kw/5000r/min (3 horsepower/5000r/min) Max Power: 3.5Kw/6000r/min (5-6 horsepower/6000r/min) Ignition Mode: CDI Model of Chain: 415 Chain Length: 110 links Compression Ratio: 6:01 Driving Ratio: 18:01 Fuel Type: No.90 Tank Capacity: 2L Speed Limitation: 38km/hour Lubrication Oil: Oil of 2-stroke petrol engine (Or oil for 10W/40.10W/30) Mixing Ratio of Fuel and Engine Oil: 16:1 for new sets, 20: 1 after running 500km Type of Sparking Plug: Z4C 14MM Volume of oil Consumption: 2.5L/100km Type of Clutch: Friction Plate / Dry Cooling Mode: Natural air cooling Package List: 1 * Fuel Tank 1 * Exhaust Pipe 1 * Engine 1 * Chain Plate 1 * Throttle Cable 1 * Transparent Hose 1 * Chain 1 * Chain Protective Cover 1 * Fuel Adapter 1 * Tensioner 1 * Throttle Handlebar 1 * Clutch Lever 1 * Clamp 1 * Ignition Accessory Kit 1 * Oil Tank Installation Accessory Kit 1 * Engine Screw Set 1 * User Manual .