In this schematic the "Ring,snap" is used most often.
A sample from the products for the Crankshaft (model Ay50w/wr) include: Gear,starter, Washer(16x29x1), Ring Set,piston, Piston Set(os:0.5).
The Crankshaft (model Ay50w/wr) assembly is constructed from several parts from which the Crankshaft is the most expensive.