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I've mounted up an ISDX on my '07 Polaris Hawkeye, and last evening my son informed me the inside of the muffler was glowing red. Sure enough it was, it was starting to get dark and was very obvious. We had been "racing" each other so I had been running it kinda hard. I stopped and pulled the plug to see if I was running lean, and apparently it's not. The plug was a nice tan color. I have also installed a DynoJet kit in the carb, so the quad has been rejetted. This was done before I mounted the SuperTrapp muffler. The quad runs fine no backfire when snapping the throttle closed, which I've heard can be symptom of a lean condition too.

I guess I'm wanting to know if this can be considered normal? It was the disc's themselves that were glowing. The outer SS skin of the muffler is turning blue right about where the disc assembly starts also. Appreciate any info anyone has on this.

 

Ive found that polaris 4 strokes run better when they are on the rich side and the plugs are a little black,Ive jetted several this way and everyone agree's they run alot better.