100cc Bike Engine Motor Kit Gas Motorized Bicycle 2-Stroke Silver 100cc 2-stroke Motorized Bicycle engine kit will fits most 24″and up bikes. This bike engine kit includes all of the necessary items to turn your pedal bicycle into a gasoline-powered motorcycle. 50mm bore, Integrated cylinder, single piece cylinder/head (increased weight capacity, lower operating temps, easier starting, sustained power output across varied rpm range) Upgraded Tunable High Performance Carburetor. Features: Choke lever on the handlebars, Main jet. (Can be re-jetted), Pilot jet, Copper oil needle , Idle RPM Screw, Idle Air Screw that delivers more fuel with the choke on, instead of restricting air. Great for cold weather starts. 4 bolts attach the engine to your bike frame and this kit comes are 8mm vs the standard 6mm. That means the mounts are twice as strong and twice as secure. 44 Tooth Sprocket, Allen bolts, Red Speed Carburetor, and Upgraded CDI. Specifics: Bore & stoke: 50mm x 40mm Ignition