Are you SURE its a flooding issue…Is the choke set correctly , and releasing… Was the the old float changed out…I’ve seen floats that have absorded gas , thus becoming heavy… Carefully inspect the fuel line from the tank to carb.for signs of deterioted hoses
At best find a repair shop , and allow them to keep as long as needed to find the problem…A mechanic can find the source of the problem if he expriences whats going on