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Reply to "Backfiring engine..."

I'm not a guru by any stretch, but two things come to mind - first, after firing her up, shut down and pull a plug to see if it's dry or wet (maybe the floats are too high, or needle/seat still has a bit of rust or dirt in there letting too much fuel through ... or a clog is keeping it from getting enough)
Second, check the timing, with all you've worked on, the timing may be out a bit and just needs a little adjustment to get her firing at the right time.
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