I noticed my Big Bear doing the same thing when I got it. I'll have to check on it tonight to see if it still does it. I have not noticed any signs of running lean. My plug checks out normal/rich if anything. I was thinking it was the metal they used. Dont know for sure. If I hear of any reasons I will post em.

 

Update- asked the stealership service tech about it. He said its normal. I dont know if I believe him. I cant find any reason for it, besides the fact that is where all the heat is at. Gonna get a pipe and filter and rejet in next few months, so I will update after that.

 

Well I have a YFZ450 and it glows pretty nicely at night too [img]i/expressions/face-icon-small-smile.gif[/img]

I had never really ridden it in the dark except for the blizzard on the 22nd but I had heard before that it was normal. I had also just gotten it back from the dealer. They did the 20hr service - oil change, adjusted the valves etc... and said it was in tiptop shape.

Anyone wanna buy it? [img]i/expressions/face-icon-small-smile.gif[/img]

 

lean is hot rich makes it cool. better fix it . that is not normal. only if you are running under a heavy load on the motor or not fast enough to cool it down should it get that red

 

Got any suggestions as to what I would need to do?? Rejet? I'am gonna end up getting some mods I'll have to rejet for anyway. This is does it while idling, or while riding. I checked the exhaust connections, checked the intake boot.

 

Thanks again. I finally did get it in for the first checkup. They checked it over; valves, plug, carburetor, etc. Everything checked out OK. The mechanic, in whom I do trust, said that the glowing exhaust is normal. I asked them especially about being too lean, as some of you indicated that too lean would harm the engine, and he said it was not too lean. So, I guess it's just gonna glow........ And, in running it, there is certainly no indication of any problem - acceleration, top speed, engine braking, idling, etc., all are excellent. Just one of those crazy things....

 

i have the same thing. Mine glows also, only at night tho it is noticable. It is not bright red, its more like a noticable orange. lol..

 

Seems like a very conflicting topic. Hopefully we can get to the bottom of this, but as for me I will not worry about it, and see what happens after mods. Thanks all.

 

yeah same. Im getting a K & N Pro flow kit with a prefilter so that ill have more clean air in my engine. ill just see what happens...

 

yea i had a 01 raptor and it glowed to and then i sold that and now i have a 04 yfz 450 and it glows like that to but i just thought it was normal and all sence there is like high octane and stuff...