Motorcycle Will Only Run With Choke On

So when your bike only runs on choke it is because the rich mixture that is being burned is actually closer to the appropriate mixture.

Motorcycle will only run with choke on. If the choke is fully on while running it means the motorcycle is trying to make the engine run richer. So here comes our first suspect the carburetor. Why a Motorcycle or ATV Only Runs on Choke An internal combustion engine needs a precise mixture of fuel and air to run properly.

If the engine only runs with the choke full on it means you have a vacuum leak and the engine runs too lean with the choke off. It means your motorcycle is not getting enough fuel and this can be caused by dirty or clogged pilot jets clogged fuel line clogged fuel filter dirty petcock loss of vacuum in the carburetors among other carburetor issues. It is an enrichener which is an additional fuel circuit for cold starts.

When you turn the choke on the engine receives more fuel and the correct air-fuel proportion is achieved for successful combustion. Consequently it only runs decently when you choke it and even then it may run badly because the mixture is not consistent. This problem is particularly rampant among ATV motorcycles and dirt bikes models.

This way your motorcycle is running only on choke. Air leak in the carburetor can make your ATV only run with the choke on The choke valve was controlling the airflow in the carburetor. It pops and hick-ups.

Basically it cant draw enough fuel with bad Diaphragm. However you start it up on choke and everything is fine until you turn the choke off and the engine dies. Then when you turn the choke off it becomes much too lean and will not run.

The reason your engine only runs with the enrichener on is because your slow speed fuel circuit is restricted. There is no off or on regarding the choke. When the engine is cold it needs slightly more fuel in the fuelair mixture for it to start which is what the choke does.