Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
It sounds like the main jet in the carburetor is still partially blocked which is not allowing enough fuel to pass through it to keep the engine running without partial choke.
The main jet is threaded up inside the stem of the carburetor, once you remove the bowl take a look up inside the stem you should see the main jet and fuel nozzle, if you will unscrew and remove them, thoroughly clean them both and reinstall it should take care of your problem.
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Did you clean the small hole that is in the center of the main jet? You can't get to it with a brush to clean it, you have to use a needle or jet cleaning tool in order to clean it.
Based on my 28 years of being in the small engine repair business this is where I think your problem is. I think that the main jet is still partially blocked therefore you are having to run the engine with the choke partially on in order for it to run properly.