I have a 2005 TRX 450 R with a big bore kit on it 478 with Port polish kettle white valves Springs. I was running 110 I didn’t know if I could run 91 in it and my header gets freaking beat red hot. Would running 91 instead of 110 make the pipe turn red like that I’ve done the jetting several times I can’t figure this out.
chingaman2001
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