wow, that's a LOT of rich man. It could be from pumping the gas and holding wide open, but I don't think so. Have you rebuild the carb recently? That looks to me like you have fuel going in where it shouldn't instead of through the idle circuit. When cranking, can you look into the carb and see if you are getting fuel dripping in from somewhere? It might just need a float adjustment or the fuel pressure might be too high and pushing past the needle.