The bearing needs oil, because it is rotating around the wrist pin. Also, in stock puch cranks that don't have small end needle bearings, so there needs to be lubrication between the brass bushing in the small end of the con rod and the wrist pin.
The bearing needs oil, because it is rotating around the wrist pin. Also, in stock puch cranks that don't have small end needle bearings, so there needs to be lubrication between the brass bushing in the small end of the con rod and the wrist pin.
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