On this parts fiche the Bolt Flange Nshf 6x2 is the most specified component.
Parts such as the Tappet Cover: Oil,seal,11x16x5, Bolt,flange,6x17, O-ring,66mm, Cover,tappet Adj are included in the Xr650r 2000 (y) European Direct Sales Tappet Cover parts fiche.
The sub assemblies and components that make up this Tappet Cover include this Valve Lifter Comp, the most expensive part.