Its purpose is to restrict the flow of air, thereby enriching the fuel-air mixture while starting the engine. ... Choke valves are important for naturally-aspirated gasoline engines because small droplets of gasoline do not evaporate well within a cold engine.

Is it bad to run an engine with the choke on?

Leaving the choke on while operating will result in excessive fuel consumption, irregular engine power performance and eventually may even damage the engine. ... Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting.

What is the purpose of a choke?

The choke is usually located towards the upper end of the carburetor, and provides this mixture by stopping the carburetors air supply. When it does that, it also creates low air pressure inside the carburetor to get more fuel to flow through the main circuit.