starter bendix gear 101 OCTANE Aprilia, Derbi, Gilera, Piaggio 100, 125, 150 2T 4T

Starter clutch for Aprilia, Derbi, Gilera, and Piaggio 100, 125, 150 2-stroke and 4-stroke vehicles.
The starter clutch creates the link between the starter and the crankshaft. The clutch secures the components if the motor is turned on and the engine revs are more than the starter motor revs. Crunching and knocking when starting often point towards a problem with the starter clutch. Leaving it could cause major damage to the engine cases.
OEM number for purpose of comparison only: 431321