Iglobalbuy 26" & 28" Bicycle 50CC 2-Stroke Motor Engine Kit for Motorized Bicycle Black Gasoline motor: 48cc,49cc, 50cc Engine Type: Single cylinder, air-cooled,2-stroke Mixing Ratio of Fuel(90#) and Engine Oil: 16: 1 for New sets, 20: 1 after Running 500Km Ignition: D. I. Ignition magnetoes non-contact induction power storage Fits Most 26"&28'' Wheeled Bikes (Mountain, Cruiser, Chopper, Road) with V-frame. The frame should have 9-11" of clearance between the bottom bracket and top bar, and the diameter of the frame tubes should be 25-29mm (around an 1"). Installation is a breeze! The rider only needs some basic hardware skills, tools, and fine tuning adjustments (Note: Seller is not responsible for misuse or this kit or any warranty after installation).