Parts such as the Camshaft - Valve: Arm,valve Rocker, Spg,valve, Valve,exhaust, Shaft, Rocker Arm are included in the Z50jp Monkey Baja Japan Camshaft - Valve parts fiche.
On this parts fiche the Cotter,valve is the most specified component.
The Nut, Tappet. is the lowest priced item on this Camshaft - Valve schematic.