Might also check to see if gas is puddling in the carb throat.
oh yea it will backfire while i am trying to restart itnot chocking it to restart. havent check spark yet was on water both times it happened and i aint got a clue what puddling in the carb throat is are how to check it.
okay went out yesterday did it again when i got home i relized both spark plugs were real loose, guess my son forgot to tighten them so i think that might be the problem, what ya thinkIf it's back fireing it still sounds like an ignition prob.