"If your 4-stroke motorized bicycle is in need of a new transmission, this Dual Chain 49cc 4 Stroke Engine Transmission will have your engine up and running in no time. This transmission will make sure your 4-stroke bike engine has what it takes to pull your bike for miles.
The freewheel behind the bevel wheel allows the drive shaft to idle, which non-dual chain transmissions don’t. Combined with dual gears to ensure the transmission chains don’t slip off while riding, these transmissions are meant to take any type of terrain you can throw at it.
Compatible with 49cc 4-stroke’s like Flying Horse 5G and Huasheng 142F motorized bicycle engine kits, this Dual Chain Transmission will get your motorized bike back on the road in minutes."