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Need more info. Was there a time when it worked right? Did it start this suddenly? Is it rich at idle, cruise, power, all? Gasoline fouling is unusual, though not impossible, but could it be oil? Is it engine temperature or air temperature related?
He probably means carbon fouling. Try backing out the idle mixture screws (under the front of the carb) out a half-turn. Maybe it's just time for a carb rebuild?
