The Screw is the lowest priced item on this Carburetor schematic.
Check out any of the forty-five Carburetor components enlisted.
Parts such as the Carburetor: Starter Lever Set, 1, Needle Set, Throttle Screw Set, Diaphragm Assy are included in the Xvs650 1999 4vr7 France 294vr-351f1 Carburetor parts fiche.