Why Does My Briggs And Stratton Engine Only Run On Choke?

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..

Is the choke supposed to be 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.

Why do I have to choke a warm engine?

In warm weather, a richer mix (more fuel in mix) is simply wastage of fuel as unburnt fuel is simply expelled. If the engine and carburetor are hot, it may happen that putting choke on will prevent ignition (engine won’t start and one can smell petrol in exhaust).

How does an electric choke on a carburetor work?

How is it operated?Electric Choke – An electric choke uses electricity to warm the spring and gradually open the choke.Divorced Choke – In a divorced choke set-up, the metal spring is located in the intake manifold. … Hot-Air Choke – In a hot air choke set-up, the metal spring is located in its own housing.

How do you fix lawn mower that starts then dies?

If the fuel cap vent is clogged, air won’t be able to enter the tank and a vacuum or “vapor lock” will occur. This stops the flow of fuel to the carburetor causing the engine to stall. To determine if the fuel cap vent is clogged, try slightly loosening the cap and then starting the engine.

What’s wrong with my carburetor?

When a carburetor is clean and is working properly, the engine should start easily (hot or cold), idle smoothly, and accelerate without stumbling. … Problems that are often blamed on a “bad” or “dirty” carburetor include hard starting, hesitation, stalling, rough idle, flooding, idling too fast and poor fuel economy.

Why does my Honda lawn mower only run on choke?

robert@honda Only runs smooth on choke usually means there’s blockage somewhere in the carb, often in the main jet or nozzle area. Depending on the specific mower, it can be cheaper/faster/less drama to simply replace the carb.

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. … 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 is my Honda lawnmower surging?

Surging can also occur due to water contaminating your fuel. … Drain the gas tank, clean the gas bowl, and add a fresh batch of fuel. Or you can inject fuel cleaner to clean the fuel line. After changing the fuel or injecting fuel cleaner run the lawn mower as usual.

Why do engines choke?

A choke valve is sometimes installed in the carburetor of internal combustion engines. Its purpose is to restrict the flow of air, thereby enriching the fuel-air mixture while starting the engine.

Why does my 2 stroke engine only run on choke?

There are two obvious causes for this to happen. The first, and most common is that the carb is simply dirty. The pilot jet may be gummed up because you have been running dirty gas, old gas, or simply stored the dirt bike with fuel still in the carb.

Why does engine only run with choke on?

An engine that will fire and run with the choke closed but dies when the choke is opened likely has debris at least partially blocking the fuel passages in the carburetor. In this condition the closed choke provides enough extra fuel to enter the engine to overcome the lack of fuel flowing through the other passages.

Can you clean carburetor without removing?

To clean a motorcycle carburetor without removing it, you’ll need to remove the bowls at the bottom of the carburetor. Once the bowls are removed, spray some carburetor cleaner up inside, wait a few minutes, then spray again to ensure coverage. Then replace the bowls and start the motorcycle to assess how it runs.

How long should you 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.