AURELIO TECH 80cc 2-Stroke Motor Engine Kit Gas for Motorized Bicycle Bike Black This bike engine kit fits most mens' 24" and larger bicycles which includes mountain, cruiser, chopper and road bikes with a V-frame and at least a 8.5" height clearance for the engine. Larger frame size requires drilling into bike frame and use of the universal face plate. Large bikes (with larger frames/down tubes) may require the Universal Motor Mount. Allows you to travel at 25 to 45 km/h. With this kit you can easily switch between pedaling (bicycle) and engine (scooter) modes- combining two pleasures in one. Amplify your pedaling power, ride farther and faster or simply feel the wind in your hair as you zip along at super-speeds. Maximum Power: 2.2kW/600r/min; Rated Power: 1.5Kw/5000r/min; Horse power: 2.75 HP. Ignition type: CDI. Engine Type: Single cylinder, air-cooling, 2-stroke; Chain Model: 415 heavy duty chain; Chain Length: 110 links, 55 in. Transmission Ratio:18:1; Compression Ratio: 6:1; Ignition Mode: CDI. Clutch Type: Friction Plate/Dry; Spark Plug: Z4C 14mm NOTE: 1. Be assured the mixing ratio of fuel and engine oil is 16:1 for new sets, 20:1(18:1 is much better in summer because of the hot weather) after running 500km. 2. Air cylinder might take some time to adjust to the load. Thus to avoid possible complications for the motor, please limit the riding time to a maximum of 1 hour for the first few rides.