07 yz450f Exhaust glowing red hot

3 replies to this topic
  • Huntin757

Posted February 25, 2014 - 06:28 PM


Just changed out stock exhaust for pro circuit ti-4 and the head pipe looks like some one had a torch to it after 2 mins at idle I can't I figure it out help please

  • grayracer513

Posted February 25, 2014 - 06:58 PM


Two minutes? No wonder.

Try a search on this subject using the words "exhaust glowing red" in quotes. If you don't find the answer, or if you get less than 20 hits on that, I'll explain it to you. Promise.

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  • Huntin757

Posted February 26, 2014 - 05:18 AM


Everything has said it's either normal or running lean explain please gray

  • grayracer513

Posted February 26, 2014 - 07:43 AM


And what do the more credible looking posts tell you? 


It's normal.  I'm surprised, frankly, that it did not also boil over in the bargain.  Two minutes is too long to let one idle.  Between the aggressive cam timing and the retarded ignition at idle, along with the relatively high idle and the extremely thin walls of the Ti exhaust, this is what happens.


It's only about 900 degrees when it does that, BTW.  A long way from melting.

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