The lowest price component in this Oil Pump parts-list fiche is the Pin-gear Change Drum.
Parts such as the Oil Pump: Guide-chain, Body, Ring-o,oil Filter, Valve-assy-relief are included in the Er650a8f Er6n 2008 Europe,middle East,africa,uk Oil Pump parts fiche.
With three applications this Bolt,flanged,6x25 is the most specified part.