A carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the vacuum generated by the operation of the engine. The carburetor is a sophisticated mechanical device that uses the kinetic energy of the suction air stream to atomize the gasoline. Its important role in the engine can be called the "heart" of the engine. The complete device shall include a starting device, an idle device, a medium load device, a full load device, and an acceleration device. The carburetor will automatically match the corresponding concentration according to the different working conditions of the engine, and output the corresponding amount of mixed gas. In order to make the mixed mixture more uniform, the carburetor also has the function of atomizing the fuel. The effect is for the machine to run normally.