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Clean the carbs high and low speed jets need to be checked out probably gummed up or trash also replace fuel filter.

Could be the plug check the gap and fire by removing it from the engine and connecting to the plug wire lead place the threaded side to the metal head on the block and pull the cord you should see a...

Check to see if the choke is stuck in the closed position if not it could be a float in the carb has a hole init and overflowing the carb.good luck.