The most reasonably priced component used on the Ty250 1976 Usa Oil Pump is the Ball.
Some items from this specific schematic: Clip (214-13164-00), Oil Pump Assy, Gear,pump Drive, Gasket 137131870000 (nas).
This OIL PUMP assembly utilises two Screw, Pan Head (7h3)(s) - the highest specified component.
