PURPOSE: To provide a carburetor fuel metering device having less change with the lapse of time in fuel metering accuracy and having excellent durability.
CONSTITUTION: In a fuel metering device composed of a jet needle 17 for fuel metering and a needle jet 18 for fuel injection, the material and the process of the jet needle 17 and the needle jet 18 are combined and used as follows: The needle jet 18 is composed of eutectoid diamond super fine-particles in a nickle-phosphorous plating processed subjected to a quenching film. For the jet needle 17, 440 series stainless steel of martensite subjected to a quenching process or a nickle-boron plating process, or eutectoid either ceramic fin- particles or diamond super fine-particles in a nickel-phosphorous plating processed film, or iron material subjected to titanium nitride coating process, is used.
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