The most expensive part in this assembly is the Chain,camshaft Drive.
The eighteen Gsx550ef 1986 (g) (e01 E02 E04 E06 E17 E18 E21 E22 E24 E25 E34) Cam Chain component parts are all listed in this schematic.
Parts such as the Cam Chain: Screw, Adjuster Assy,tensioner, Nut 6mm, Washer are included in the Gsx550ef 1986 (g) (e01 E02 E04 E06 E17 E18 E21 E22 E24 E25 E34) Cam Chain parts fiche.