The Carburetor is made up of components including this Carburetor Assy which is the most expensive.
Parts such as the Carburetor: Cap-chamber,mixing, Circlip, Carburetor Assy, Cover-main Jet are included in the Kt250-a 1975 Usa / Mph Carburetor parts fiche.
In this schematic the "Screw-float Chamber" is used most often.