The Crankshaft - Piston is made up of components including this Crankshaft Assy which is the most expensive.
Some items from this specific schematic: Crankshaft Assy, Pin, Crank, Piston (0.50mm O/s), Piston Ring Set (std).
seventeen components are listed in the schematic for this Yfm80s Moto-4 1986 Crankshaft - Piston .