Parts such as the Crankshaft - Piston: Housing, Oil Seal, Piston Ring Set (2nd O.s), O-ring (688), Clip, Piston Pin are included in the C85trq 1992 Crankshaft - Piston parts fiche.
The most reasonably priced component used on the C85trq 1992 Crankshaft - Piston is the Washer, Plain (646).
The Yamaha CRANKSHAFT - PISTON has twenty-eight products enlisted in the schematic.