||A light vehicle under normal conditions needs an air-fuel ratio, by mass, of about 15 to 1. By volume, that's 11000 to 1.
|Carburetor system components
||The main components in most carbureted systems are a float chamber, a venturi, the throttle, idle circuit, main circuit, a choke and an accelerator pump.
||Low speed and idling ports allow the engine to operate with a low throttle opening before the main system is operating fully.
||The main jet size is selected to provide the best mixture for fuel economy. An extra jet supplies additional fuel for maximum power.
||For acceleration, suddenly depressing the accelerator delivers extra fuel into the airstream.
||A two-stage carburetor has a primary throttle open only from idle to medium speeds. At higher speeds, the secondary throttle opens to admit more air-fuel mixture.