Variable venturi-type carburetor

摘要

A variable venturi-type carburetor comprising a suction piston and a needle. The root portion of the needle is fixed onto the central portion of the tip face of the suction piston. An annular groove is formed on the tip face of the suction piston around the root portion of the needle. A narrow groove is also formed on the tip face of the suction piston and extends downwardly from the annular groove to the downstream end of the tip face of the suction piston.