In this schematic the "Bolt" is used most often.
Parts such as the Crankcase Cover: Cover,signal Generator, Bolt, O Ring(d:3.1,id:16.8), Gasket,signal Gen Cover are included in the Rf600ru 1994 (r) (e22) Crankcase Cover parts fiche.
The sub assemblies and components that make up this Crankcase Cover include this Cover,clutch, the most expensive part.