From your description it sounds like the float is sticking, causing the float bowl to overflow. If that is the case, give the top of the carb a few good whacks with a small hammer (no, not hard enough to break the carb body). If this clears up the problem, it's not fixed, but you'll know what to do. Disassemble and rebuild/repair the carb.
Thanks for the pic, jedimario.
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