Starter Motor Whirs But Engine Wont Turn: Motorcycle Sprag Clutch Diagnosis and Test

Access the Moto-Scope Manual directly right here: https://sites.google.com/view/moto-sc... The sprag clutch is the most critical part of your motorcycle's electric start system. It acts like a one-way bearing: it locks up to drive the crankshaft when you press the starter button, and then instantly disengages to freewheel once the engine is running. When it fails, you hear the starter motor spin freely with a whirring noise but the engine doesn't turn over. This video fully explains the sprag mechanism, common failure causes (low battery!), and how to diagnose it #SpragClutch #MotorcycleStarter #StarterClutch #OneWayBearing #MotorcycleRepair #StarterMotor #SpragClutchFailure #WhyWontMyBikeStart #SpragClutchExplained #DIYMotorcycle