Secondary Gears \/ Output Shaft long – GY6 50cc 139QMB

Secondary Transmission \/ Output Shaft long – GY6 50cc 139QMB, long final drive shaft. This kind of long shaft is used on vehicles with a swingarm on the right side, and, in most cases, with rear disc brake and twin rear shocks. Since the output shaft is installed through the swing arm, it has to be a little longer.