The Screw-pan-cros is the lowest priced item on this Carburetor schematic.
Parts such as the Carburetor: Pin,float, Case,carburetor, Gasket,diaphragm (nas), Washer,adjust Screw are included in the Jb650-a2 Jetmate 1990 Europe Carburetor parts fiche.
Check out any of the thirty-one Carburetor components enlisted.