With a quantity of seven pieces, the Screw, Pan Head(3xp) is the most used part in the CRANKCASE diagram.
Parts such as the Crankcase: Bush, Bimetal Formed (14t), Screw, Pan Head(3xp), Grommet (5g3), Clamp(14u) are included in the Ca50n 1985 Riva Crankcase parts fiche.
This schematic depicts all components used in the Ca50n 1985 Riva Crankcase partslist.