Totally agree it is running lean which is why adding choke will let it run better. The seafoam should do the trick. If it doesn't you could remove the carb and soak it in a carb cleaning solution. Gunk makes one in a gallon can.
You might find this amusing.Thanks - will give it a try. Just picked some up. I never messed with a carb on one of these things. I didn't think they could get messed up so easily and soon. Still unsure how much Seafoam to put in a tank. Is half Seafoam and half gas too much?