Carburetor

A carburetor comprising means defining an elongated casing having opposed upper and lower ends with an air inlet provided at said upper end and an air-fuel mixture outlet provided at the lower end, means provided in said casing between said inlet and said outlet defining a restricted, annular passage of minimum cross-sectional area with respect to said casing constituting a sonic throat for flow therethrough of air and entrained fuel, flow stabilizing means disposed on means defining said throat, comprising a plurality of circumferentially spaced-apart first indentations opening toward said passage and said flow therethrough, said first indentations extending above and below said sonic throat and a diffuser section below and communicating with said sonic throat, a vertically disposed plug provided interiorly of said casing and extending through said sonic throat constituting an inner boundary thereof, means for shifting said plug vertically reciprocally within said casing, said plug carrying second indentations opening toward said passage and said flow therethrough in normally confronting relationship to the first indentations for cooperation therewith for flow stabilization.