First, pinch off the fuel line running to the carb to stop gas leakage. Loosen the bolt under the carburetor bowl and carefully remove the bowl. Clean any foreign matter from the bowl. Check the O-ring that is between the bowl and carburetor and if it’s dry and brittle replace. Finally, and very importantly, use a very small wire and clean the holes in the bolt that secures the bowl to the carburetor then carefully use compressed air to blow in the threaded end. Air should escape both sides of the bolt. Carefully replace all parts and start you engine.