The most reasonably priced component used on the Cb250rs 1980 (a) Belgium Crankcase is the Bolt,hex 6x12.
The Honda CRANKCASE has fifteen products enlisted in the schematic.
Parts such as the Crankcase: Dowel,pin,12x20, Pipe,oil Pass, Screen,oil Filter, Bolt,flange, 6x32 are included in the Cb250rs 1980 (a) Belgium Crankcase parts fiche.