I know this topic has been discussed before but I never payed much attention because I didn't have the glowing head pipe problem until I installed an FMF TI-4 exhaust and power bomb header. Now my head pipe really glows red when I ride hard. I did a search on this topic and I got a lot of conflicting answers. Some people said it was normal, some said it was caused by a lean condition. I was wondering if anyone had any new information on this. It makes me a little nervouse when it starts glowing. I haven't noticed a lean condition in my jetting. My jetting is a 175 main, 45 pilot, YZ needle on clip #4 and 1-3/4 turn on the fuel/air screw. My elevation is about 1000 feet.