Carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the vacuum produced by engine operation Carburetor, as a precise mechanical device, atomizes gasoline by using kinetic energy of inhaled air flow. Its important role in the engine can be called the "heart" of the engine.Carburetor is composed of upper, middle and lower parts, the upper part has an oil inlet nozzle and choke valve, the middle part has a float chamber, a throat, a metering hole and a nozzle, and the lower part has a throttle valve etc.