Feature: 1. 4 Stroke: Our engine kit is 4 stroke 49CC, and applicable for 26 to 28 Inch Bike. Maximum speed is between 27 to 32MPH or 43 to 51KPH. 2. Low Noise: This motorized bike engine kit is quieter and lower noise when running, and the fuel tank can hold 2 liters of gasoline. 3. Metal Body: The 4 stroke motor in this motorized bike engine kit kit is made of heavy duty metal body, which is durable and practical. 4. Kit Using: Motorized bike engine kit can convert most traditional manual bikes to electric bikes, including engine, fuel tank, etc. Suitable for mountain bikes, road bikes, etc. 5. Stable and Reliable: The motorized bike engine kit is very safe, stable and reliable after the overall installation is completed. Specification: Item Type: Motorized Bike Engine Kit Product Model: 142F 1 G Product Type: 4 Stroke OHV 1 Grade Product Displacement: 49CC Bore: Approx. 41.8mm / 1.65in Stroke: Approx. 35.8mm / 1.41in Maximum Power: 1.4kw/6800rpm Maximum Torsion: 2.0(Nm)/4500rpm No Load Maximum Speed: 7500rpm Output Shaft Size(Diameter): Approx. 15.80 x 33.5mm / 0.62 x 1.32in (Same as for GXH50p) Fuel Consumption: 480g/Kw Hour Engine Cooling: Air Cooled Ignition: Throttle control ignition Fuel Tank Capacity: 2L Engine PTO Speed: CCW Engineering Compression Ratio: 7.4 Engine Idle Speed: 1800±152rpm Applicable Models: 26 to 28 Inch Bike Maximum Speed: 48km/H Maximum Load: 180kg. Package List: 1 x Engine1 x Fuel Tank1 x Fuel Tank Cover8 x Bracket22 x Screws14 x Nut17 x Gasket25 x Washer1 x Instruction Manual1 x Exhaust Pipe1 x Chain Protection Cover1 x Fuel Line1 x Grip1 x Throttle Grip16 x Accessories1 x Clutch Pull Cable1 x Chain1 x Filter2 x Gear Disk2 x Crankshaft1 x Screw1 x Protection Cover