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Originally Posted by zbbt  that guy is 100% IN-correct. no engine should glow headers at idle. look at F1, there headers barely glow on test stands that reproduce track conditions while stationary. no big bike of mine that runs correctly would have those symptoms |
If I am wrong and you are right, then there should be one hell of a recall issue on MX bikes on the market. They all do it. Yes they come lean from the factory, but if there is no air flowing to them, they get red.