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2004 CRF450R Carb issues?

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I just purchased a used 04 CRF 450 with very little use. It seems to pop/backfire more than I think is normal. Also the header glows bright red for about the first 8 inches from the head. I'm guesing I need to change the needle valve setting but don't know which way to go with it. Any help would be great.

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Sounds like the fuel screw or pilot is lean. How many turns out is it? What pilot?

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