Not Ranked
This happened to me once and it turned out to be loose header bolts.
However, Demon carb tech sheet says backfires out of exhaust can be remedied by one or more of the following:
Lowering float level
Decrease fuel pressure
Decrease jet size
Readjust primary and secondary butterflly position
Roscoe
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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