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How do you know the carb is OK? Just because you have cleaned/rebuilt it, doesn’t mean it isn’t flooding over…But, I would think you would be able to see fuel dribbling out of the carb throat if it was flooding. Trying trimming the engine up just slightly from its vertical running position, then connect the fuel and pump the fuel bulb. You will see fuel dribbling out of the carb throat if the carb is flooding over.
The fuel pump could be damaged causing it to flood one cylinder. Remove the fuel pump, then pull the thick gasket off the powerhead. Now reattach the fuel pump to the crankcase without the gasket in place, snug the attaching screws, don’t over tighten them. Now pump the fuel bulb, you should not see any fuel spilling out of the back of the fuel pump. If fuel is spilling out, the fuel pump diaphragm is damaged. Don’t forget to reinstall the gasket afterwards, and don’t pull that fuel pump apart unless you have confirmed it is to blame. Not all fuel pumps are rebuildable, and you surely don’t want to pull it apart if it is OK…