The Screw is the lowest priced item on this Cam Chain (model Z) schematic.
A sample from the products for the Cam Chain (model Z) include: Tensioner,cam Chain, O Ring(d:2.4,id:20.8), Washer, Screw (6x25).
eighteen components are listed in the schematic for this Gsx250 1982 (z) General Export (e01) Cam Chain (model Z) .