The most reasonably priced component used on the Yg5t Trailmaster 80 1968 Usa Crank Case is the Ybs66-6 Washer, Plain.
The Crank Case is made up of components including this Cylinder which is the most expensive.
Parts such as the Crank Case: Pin,dowel (137), Ring,rubber, O-ring (122), Screw Pan Head are included in the Yg5t Trailmaster 80 1968 Usa Crank Case parts fiche.