The component with the lowest price in the OIL PUMP schematic is the Screw,pan 4x8.
Parts such as the Oil Pump: Bolt,flange,nshf,, Rotor A,inner Oil, Rotor B,inner Oil, Plate A,oil Pump are included in the Xr650r 2006 (6) General Export / Kph Oil Pump parts fiche.
The most expensive part in this assembly is the Rotor B,outer Oil.