The component with the lowest price in the CRANKCASE schematic is the Pin.
The thirteen Zr50sk 1982 (x) (e02 E16 E17 E21 E41) Crankcase component parts are all listed in this schematic.
A sample from the products for the Crankcase include: Screw (6x35), Pin, Washer, Bolt 8x75.
