Some items from this specific schematic: Seat,oil Pump, Bolt,flange,6x35, Dowel,pin,10x16, Body,oil Pump.
The most reasonably priced component used on the Xr250l 1992 (n) Usa Oil Pump is the Screw,cross,5x16.
With a quantity of three pieces, the Screw,cross,5x16 is the most used part in the OIL PUMP diagram.