You need to find out where your timing is at, but, more importantly, you need to replace the power valve in your carb. If it backfired through the carb, it blew out the power valve, and no matter what you do, it will continue to backfire through the carb, with flames.
If you have any other questions, I'll try to answer them tomorrow. We're racing tonight, and I have to go get ready.
Take care,
~Chris
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