From hearing your guys thoughts and talking with a few people, I am starting to think it is the carb too. This is the second time I have heard that it might be lean.
After the holidays I am going to take apart the carb and see what jets it has. It was recommended to me to start with stock jets, and then adjust accordingly from there.
It doesn't backfire through the exhaust, only through the carb. It actually caught fire at the top of the carb, a small flame that burned, until I put is out real fast.
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Travis
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