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install FMF Q now pops and backfires need help

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hi have new 03crf450 ran fine with stock pipe install FMF Q now hard to start,pops and backfires flames when giving it gas. Is it to lean ? jetting recomendations?

thanks

casey

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Make sure you do not have exhaust leaks. Did you replace the gasket in the head? If all is good, I would try a quarter turn of the fuel screw(out)to see if it improves. If it does you are lean.

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