Parts such as the Crankcase: Bolt(8x67), Bolt(8x100), Bolt(8x50), Pin are included in the Gz250 2000 (y) (e01) Crankcase parts fiche.
The Bolt is the lowest priced item on this Crankcase schematic.
The Gz250 2000 (y) (e01) Crankcase consists of eleven pieces with the Crankcase Set being the most expensive.