Carburetor with regulating valve limiting device

In a carburetor for an engine which has at least one fuel regulating needle valve with a shank received in a threaded hole in the carburetor body with a needle potdon adjacent one end of the shank and a head adjacent the other end of the shank, a limiting device comprising a generally cylindrical cavity in the carburetor body having a diameter larger than that of the threaded hole in which the needle valve is received and opening to the exterior of the carburetor body, a threaded portion on the shank and adjacent the head having a larger diameter than the threaded hole in the carburetor body in which the needle valve is received, a stop ring in contact with a shoulder of the cylindrical cavity and threadably received on the larger diameter threaded portion of the needle valve, a cup-shaped cap secured with the head of the fuel regulating valve, an axial protrusion on the outer periphery of the cap, a generally axial groove in the cylindrical cavity in which the protrusion of the cap is received, and a retaining plate having an opening through which the cap can extend, said retaining plate being fixed to the carburetor body adjacent the outer end of the cylindrical cavity.