Flying Horse 49cc 4-Stroke Motorized Bicycle Engine Clutch Bell Rotor &ndash; Gas Bike Clutch Bell Rotor Replacement The 4-Stroke Bell Rotor works well with the Flying Horse 5G and Huasheng 142F chain-driven transmissions Installation is simple: loosen the nut from the existing bell rotor, slip off the bell rotor, install the new bell rotor, fasten the nut, and you're ready to roll Do not over torque the bell rotor. You may cause damage to the bell rotor and the transmission as a whole Note: This bell rotor is for chain-driven transmissions and is not compatible with Grubee 4G transmissions, belt-driven, and gear-driven transmissions