OK, not a GC expert, but i have worked on a lot of cars. Try some spray carb cleaner, also, many small engines have a float in the carb. As I recall these can be accessed by dropping the bowl. Check for dirt where the needle valve is located, try spraying carb cleaner in this area. You might want to see if you can get a rebuild kit, as the needle valve may have failed, allowing excessive gas to accumulate.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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