The component with the lowest price in the CAMSHAFT / VALVE 81-82 schematic is the Nut, Tappet.
This Camshaft / Valve 81-82 diagram displays the required parts for the Xr500r 1981 (b) Usa Camshaft / Valve 81-82.
Some items from this specific schematic: Ret,valve Spg, Plug,camshaft, Shaft,rocker Arm, Shaft,ex.rkr.arm.