Parts such as the Oil Pump: Pin, Spring (647), O-ring, Gasket 137131870000 (nas), Plate, Adjusting are included in the Yt60n Tri-zinger 1985 Usa Oil Pump parts fiche.
The sub assemblies and components that make up this Oil Pump include this Oil Pump Assy, the most expensive part.
The component with the lowest price in the OIL PUMP schematic is the Circlip(6l2).