Backfiring is a sign of being lean. I'd look for an air leak.
Most of these carbs need jetting. Something about their supplier. I have to get a new carb for one of these helix buggies because the carb is machined horribly. They really need a new supplier for their carbs. I put a 130 in all of mine and they run rather well and the plugs look beautiful on them.
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