The most reasonably priced component used on the Jb650-a2 Jetmate 1990 Europe Crankcase is the Pin,dowel,10x8.2x14.
On this parts fiche the Screw,reed Valve is the most specified component.
Parts such as the Crankcase: Bolt,6x25, Bolt-stud, Bolt,8x65, Valve-reed are included in the Jb650-a2 Jetmate 1990 Europe Crankcase parts fiche.