A carburetor body including a cylindrical bore, a frusto-conical stepped shoulder portion,Bellows Seal Valves a valve chamber and an outlet passage which are coaxially provided and sequentially reduced in the inner diameter inwardly from an end wall face thereof. A plastic retainer and a metal collar are interference fitted into the cylindrical bore.Needle Valves The fuel regulating needle valve includes a screw shaft portion, an unthreaded stem portion and a valve tip which are sequentially reduced in the outer diameter from a head of the fuel regulating needle valve toward the valve tip.PLUG VALVES The threaded shaft portion is screwed into a threaded bore formed in the metal collar, and at the same time, screwed into an axial bore formed in the plastic retainer while cutting thread grooves. The unthreaded stem portion projects from a distal end cylindrical portion of the plastic retainer into the valve chamber, and the valve tip projects from the valve chamber into the outlet passage.

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