Description Clutch / Rear Pulley Assembly for Aprilia / Piaggio 50cc 2T Models These parts wear out over time, and have a number of non-replaceable moving parts inside them. a worn out torque driver typically manifests as sudden reduction in gearing while accelerating, causing a sudden decrease in the revs (feels like changing from 1st gear to 5th gear in a manual car) causing the bike to bog down. Replacing the whole assembly is super easy, and sorts the issue right out!
