The most expensive part in this assembly is the Camshaft.
Parts such as the Camshaft / Valve: Shaft,rocker Arm, O Ring 9.0x1.6, Valve,ex., Spring,rocker Arm are included in the Cb650sc Nighthawk 1982 (c) Usa Camshaft / Valve parts fiche.
On this parts fiche the Cotter, Valve is the most specified component.