Crankshaft bearing, crankcase for APRILIA 4 stroke
Crankshaft bearings for APRILIA 4-strokes.
When to replace them?
They carry the crankshaft in the crankcase. A worn bearing develops play, noise and vibration, and eventually damages the case or the crank. Replace them as a pair with the oil seals during a bottom-end rebuild, with the same size and internal clearance as the original.