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Unrelated glowing Header

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I just bought a 99 wr400. Upon start up the header started to glow after about 4 minutes on high idle. Temp outside was -6C. The bike has a fmf silencer on it and I believe the a 160 main jet. I put the stock pipe back on and it did not glow. Is the solution a 165 or 168 main, while running the fmf pipe? I am new at this and could use some advice. Thanks

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