I’ve had the same clogging carburetor issues… After a few rebuilds that lasted for a few months… And some serious coins, I decided to try my hand at it. Much to my surprise, I found lots of black, coffee ground like, debris in the tank? And the screens on the fuel inlets inside the fuel tank were completely destroyed? I’ve cleaned out the carburetor and fuel tank. Now waiting for a new fuel inlet/filter assembly. It’s not rocket science. Take it apart and take a look.