Parts such as the Camshaft/valve: Valve, Inlet, Cotter, Valve, Screw,tappet Adj., Arm,valve Rocker are included in the Crf100f 2011 (b) European Direct Sales Camshaft/valve parts fiche.
The Camshaft/valve is made up of components including this Camshaft which is the most expensive.
The component with the lowest price in the CAMSHAFT/VALVE schematic is the Nut, Tappet..