With more linear slots, Naraku's Adjustable Drive Sheave (torque driver, secondary slider) improves acceleration and top speed in bikes with 50cc 139QMB engines.Specifications:
NOTE: If installing on a CSC go, you'll need these clutch slider pins
Compatibility:
139QMB-based 50cc / 80cc engines with the following engine codes:
Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle.
About Naraku: NARAKU is a professional supplier of motorcycle parts from Taiwan. We’ve sold various motorcycle parts, scooter parts and accessories for more than 10 years. Our quality products are sold to Europe, Asia and America. We supply engine parts and accessories for modern scooters and mopeds. With our advanced technologies and the superb quality of our products, we can offer everything your ride needs.
