Parts such as the Valve(s): Shim,t=2.20, Retainer-valve Spring, Shim,t=2.65, Shim,t=3.10 are included in the Kl650a1 Klr650 1987 Europe Fr Uk Ar Fg Gr It Nr Sd Sp St Valve(s) parts fiche.
On this parts fiche the Collet,retainer is the most specified component.
The component with the lowest price in the VALVE(S) schematic is the Collet,retainer.