The Screw is the lowest priced item on this Signal Generator schematic.
With three applications this Screw is the most specified part.
Parts such as the Signal Generator: Washer, Lower, Ignitor, Screw, Bolt are included in the Gsxr750 1989 (k) (e01 E02 E15 E16 E17 E18 E21 22 24 25 34 39 53) Signal Generator parts fiche.