Flying Horse 49cc 4-Stroke Motorized Bicycle Engine Clutch Flyweight &ndash; Gas Bike Clutch Replacement The 4-Stroke Clutch Flyweight works with the Flying Horse 5G and Huasheng 142F chain-driven transmission to engage your motor Some experience is required for installation: Uninstall the transmission and expose the flyweight. Once exposed, gently pry the flyweight off with even pressure on all sides, making sure to keep and eye on the key that holds the flyweight on to its shaft. Line the key inside of the new flyweight and align the assembly with its shaft. You will then need a press in order to press that piece on to the shaft. Once installed, reinstall your transmission and you'll be ready to ride Note: This flyweight is for the Flying Horse 5G and Huasheng 142F 49cc 4-stroke bicycle engine kits. Other sized transmissions with not be compatible. Key not included with flyweight, if your key is loose be sure to purchase another