Roger, I know this will sound a little off base since the engine appears to be flooding. Have you checked the fuel filter screen that is built into the carb. It will catch far more trash than most of the filters we place in line between the tank and carb. It also can keep the motor from starting/running but still let some fuel through which would make the plug look wet. It is very easy to check. When the motor is mounted cylinder down, look on the top of the carb. One large screw is removed, lift up the plate then lift the gasket off of the carb body. You will easily see the filter screen in the carb body.

Good luck on running down your problem
Gary