The most reasonably priced component used on the Gz250 1999 (x) (e01 E02 E04 E17 E18 E22 E24 E25 E34) Cam Chain is the Gasket 8.2x14x1 (nas).
ten components are shown in this Gz250 1999 (x) (e01 E02 E04 E17 E18 E22 E24 E25 E34) Cam Chain exploded diagram.
With two applications this Bolt is the most specified part.