new leo vince, header pipe glowing on warmup

3 replies to this topic
  • stev0

Posted August 03, 2010 - 10:03 AM


I just dumped on a new leo vince x3 2004 YZ pipe on my 06 WR450. This is the model before the inserts came into play. Man it sound good, but I noticed my header started to glow on the warm up? My guess is I need to rejet, but my stock gutted pipe never gave me any issues?

The bike was started at night and then warmed up.


  • stev0

Posted August 03, 2010 - 10:05 AM


Oh forgot to mention, it was also shooting 2 inch flames every now and then on the decel.

I still have AIS installed.

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  • William1

Posted August 03, 2010 - 10:43 AM


Glowing thin wall header is normal.

Having the AIS contributes somewhat to the decel popping but then again, so does an open pipe.
You probably need to go up a size or two on the main and a down a clip or teo on the needle. But, if the bike runs good, all may ok already. All you can do is experiment using a stop watch to see if there is improvement.

  • stev0

Posted August 03, 2010 - 10:56 AM


Sounds damn good!

Ill plug the AIS and see whats up...

Ive read that its pretty normal on the glowing pipe... but it could also be lean...


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