The component with the lowest price in the CRANKCASE schematic is the Washer,plug,drain 12.
The Crankcase is made up of components including this Crankcase Comp.,l which is the most expensive.
The Bolt,cyln Stud is the most widely applied product in the CB250 NIGHTHAWK 1991 (M) CANADA / KPH CRANKCASE ( eight times ).