On this parts fiche the Bolt,flange,nshf, is the most specified component.
Of all the components used in this assembly the Head Assy,cylinde is the most expensive.
Parts such as the Cylinder Head: Plug, Spark (bkr7e-11) (ngk), Washer Sealing, Joint,water, Insulator,carb are included in the Xr650r 2001 (1) Australia / Csw Cylinder Head parts fiche.