On this parts fiche the Cotter,valve is the most specified component.
Parts such as the Camshaft/valve: Nut, Tappet, Follower,cam, Valve,exhaust, Brg,ball,radial 6 are included in the Trx500fm Fourtrax Foreman 2006 (6) Australia Camshaft/valve parts fiche.
The Honda CAMSHAFT/VALVE has nineteen products enlisted in the schematic.