The component with the lowest price in the FUEL COCK schematic is the Bolt(6x20).
In this schematic the "Bolt" is used most often.
Parts such as the Fuel Cock: Hose,fuel, Plate,fuel Drain, Bolt, Gauge Assembly,fuel Level are included in the Gsx1150ef 1985 (f) (e06) Fuel Cock parts fiche.