The Circlip,ex16 is the lowest priced item on this Kick Starter Spindle 81-82 schematic.
On this parts fiche the Washer,thrust,18 is the most specified component.
The Xr500r 1981 (b) Usa Kick Starter Spindle 81-82 consists of twenty pieces with the Spdl,kick Start. being the most expensive.