What Is Choke Used For?

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..

How do you adjust the choke on a carburetor?

With the engine off, turn the throttle to its side wide open position and hold it there. This will expose the fast idle set screw behind the choke housing. Using a ¼ inch open-ended wrench, turn the screw clockwise to increase the rpm or counter clockwise to decrease the rpm (see right).

How do you start a car with choke?

How to Use a Manual Choke on a CarPull the manual choke knob to decrease the air intake and provide a richer fuel-to-air ratio before you start the ignition. … Pull out the choke knob more for a cold engine start, or on a cold day. … Switch on the ignition and start the engine.More items…

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.

Which position is choke on?

A rich mixture is needed to start your bike when it is cold… colder than a cup of coffee. Typically the “choke” is on when the choke lever is in the up position or when the choke lever is inline with the handle bars on your bike. Choke on means that the choke plate is covering the carb throat.

What happens if the choke is left on?

Leaving the choke on for too long will cause unnecessary engine wear and waste fuel. … The engine needs its fuel to be vaporised in order to burn it. This is done by the carburettor where the fuel is mixed with clean air coming from the air filter, and sent into the pistons to be ignited.

Why do I have to choke a warm engine?

The choke ‘chokes’ air going into the engine through the carburetor, effectively increasing the amount of fuel in the cylinder. In cold weather, this increases the chances of ignition. … In warm weather, a richer mix (more fuel in mix) is simply wastage of fuel as unburnt fuel is simply expelled.

Do you leave the choke on?

What happens if you leave the choke on too long? Leaving the choke on for too long will cause unnecessary engine wear and waste fuel. This is also bad for the environment. One a cold day, the engine can need more fuel than usual to get running – this makes the mixture ‘rich’, and this is what the choke does.

How does choke work?

By restricting the flow of air into the throat of the carburetor, the choke valve reduces the pressure inside the throat, which causes a proportionally-greater amount of fuel to be pushed from the main jet into the combustion chamber during cold-running operation.

Why does my engine only run on choke?

If a motorcycle or ATV only runs with the choke on, it’s because the richer “choke on” mixture is actually closer to the engine’s normal operating fuel mixture than the leaner “choke off” mixture. So when the choke is turned off, the engine gets too little fuel and too much air for it to run and it stalls.

When should you choke your engine?

The choke is only used when starting a cold engine. When doing a cold start, the choke should be closed to limit the amount of air going in. This increases the amount of fuel in the cylinder and helps to keep the engine running, while it is trying to warm up.

Is the choke open or closed?

The choke is a plate in the carburetor that opens and closes to allow more or less air into the engine. When doing a cold start, the choke should be closed to limit the amount of air going in. This increases the amount of fuel in the cylinder and helps to keep the engine running, while it is trying to warm up.

How long should I leave the choke on?

30 secondsThe choke usually “chokes” the air supply into the engine so it gets more petrol than usual. Hence it’s name. You should start the bike from cold with half or full choke depending on how cold it is. After 30 seconds is usually enough for most bikes.

How do you start a car with an electric choke?

If the choke is an automatic type, one or two strokes on the gas pedal will set it. Assuming the ignition is up to par you can now hit the starter. With your foot pushing the gas pedal down about 1/2 of the way, crank the engine until it fires. It will usually start running, but rather rough.

Why do engines need choke?

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.