化油器的作用是将汽油雾化与空气混合形成可燃混合气，然后送如各个汽缸。当汽油通过汽油泵送如化油器中的浮子室，在浮子室内有一个量空，它可以通过外界气体压力与喷管形成（真空）压力差，直接将油喷入吼管，变成油滴与吼管上部通过空气滤清器的空气混合，化油器还分五大系统，主供油、怠速、加浓、加速、起动.
提供发动机启动、冷启动、加速、怠速、正常工作等各种工况下的一定数量与浓度的可燃混合气。它包含有主供油系统、怠速供油系统、过度喷孔、加速泵、节气门、雾化喉管、阻风门、快怠速机构、空调提速机构、油平面浮子调整装置等装置，利用流经主、副腔高速气流的虹吸作用把汽油从浮子室吸出，同时利用气流的切割作用将汽油破碎成细小颗粒形成初步混合的混合气，再经由进气歧管、进气门活塞等加热蒸发形成可燃气 。
空气在进气冲程的吸力作用下，以较高的流速流经化油器。
空气流经化油器喉管（气道截面积缩小部位）形成真空度，连接浮子室的喷管口也在喉管处，油从喷管吸出，高速进气气流将被吸入化油器喉管的汽油吹散和雾化，形成可燃混合气进入气缸。
Is the role of carburetor gasoline atomization mixed with air to form mixture, then send as each cylinder.When gasoline by gas pumping as the float chamber of the carburetor, the float indoor have empty a quantity, it can (vacuum) are formed by the gas pressure and the nozzle pressure difference, oil injection directly to roar, into the oil mixed with the roar of upper tube through the air cleaner air, carburetor and also five systems, the main oil supply, idle, add thick, acceleration and starting.
Provide the engine starting, cold start, acceleration, idle, normal work under various working conditions, such amount and concentration of combustible gas mixture.It contains a main oil supply system, the fuel supply system in idle speed, excessive nozzle throat, accelerating pump, throttle, atomization, the choke, fast idle mechanism, air conditioning speed, oil plane float adjustment device, such as equipment, use of airflow Lord, vice cavity high-speed siphonage sucked the gas from the float chamber, and at the same time, and the cutting of using air gasoline broken into tiny particles formed a preliminary hybrid mixture, through the intake manifold, intake valve piston forming gas heating evaporation.
Under the action of suction of air in the intake stroke, with high velocity flow through the carburetor.
Air flowing through the carburetor throat airway cross-sectional area (narrow) form the vacuum degree, connected to the float chamber nozzle mouth also in the throat, oil from the suction nozzle, high speed air intake airflow will be drawn into the carburetor throat gas blow and atomization, form a combustible mixture into the cylinder.