If it was the accelerator pump, it would bog when he punched it, then recover and go fine until he backed off, and hit it again. I suspect he has too much total advance, or shouldn't be using the vacuum advance, and has caused an intake backfire that now has blown out the power valve, resulting in it always backfiring through the carb. Hard to say without being there.
ponyexpress289-
If you just let it idle for 10 minutes, does it start to run rich? What's the carb List# (look on the airhorn for something like; "LIST-4777-1")?
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