The sub assemblies and components that make up this Carburetor include this Carburetor-assy, the most expensive part.
Parts such as the Carburetor: Ring-o,adjust Screw, Collar,throttle Stop, Carburetor-assy, Plate are included in the Js650-a2 Jetski650sx 1988 United Kingdom Fr Al It Carburetor parts fiche.
In this schematic the "Screw,4x16" is used most often.