Yamaha yfz 450 header pipe glows red

[Yfz450guy012]

I have been told this is normal but just wanted to confirm it. When my quad is warmed up the header pipe will start glowing red after I ride it for a while and then sit and idle for a little. Then when I ride it again it stops glowing as bad. I have already jetted the carb and it doesnt spit and sputter at all. My buddy has a trx450r and his does the same thing.. but not as bad. Could I still be running lean? i believe my jet combo is a 48 pilot and a 165 main with GYTR exhaust running an open airbox.

thanks for the help

Jason

[NYMXer]

The head pipe is so thin that the heat from the exhaust makes it glow red. Lean jetting can make it worse but if it runs good I would ignore the red head pipe.

[Crf230 Rider]

Yeah, that's pretty normal. It's kinda neat looking at it in the dark. I know our neighbours quad, he was bagging it all day and at night time when he turned it off we even saw the baffle inside the muffler glowing.

[icedcap]

you're running lean, try the 175 main jet. the 48 pilot is okay. you'd rather run a little rich, than a little lean.

IcedCap

[yfz thumper]

Completely normal... Both my Brothers 06 and my 07 do the same thing. Just watch the pipe when it is that hot. Stock pipes comes with a small shield, but a lot of the after market pipes have no shield. My brother melted his pants on his. Hot Hot:mad: But NORMAL

[sauve-yfz450]

Normal my 04 did it from the first day i rode it.still does it with all the modes

[Octane250F]

A 165 main is a little on the lean side, but if the quad doesnt spit or sputter you should be OK.

As was said, the walls on the headpipe are so thin that if you arent moving it doesnt take long for the headpipe to glow cherry red. It freaked me out at first, but everyone Ive talked to said its perfectly normal.

[TuningFork426]

its fine, completly normal.

[jw yama 76]

My 05 did the same stock. But after adding a HMF and JD jet kit it dosent anymore. And by the way this thing rips....CRF's got nothing on me:moon:

[crf-f crf-r trx cbr]

My 05 did the same stock. But after adding a HMF and JD jet kit it dosent anymore. And by the way this thing rips....CRF's got nothing on me:moon:

hahahahahhahahahahahahahahha----------

[crf-f crf-r trx cbr]

glowing red hot is a lean condition----absolutely normal and is nothing to worry about----unless you are so lean that you see white deposits at the end of you exhaust

[Raptr66013]

You have problably already been told this but to an extent this is normal but you may be a little lean.

[upstate]

hahahahahhahahahahahahahahha----------

I find that a little hard to believe that a CRF has nothing on you. I have both a 05' CRF and 06' YFZ and unless they both fell off a cliff and you are counting on gravity to help you then I think that might want to rethink that statement or at the very least put someone on the CRF that can ride.

[rdrckt780]

As i have read the forum, i was wondering if the whole pipe glows are is it just red for 6 inches. the 06 yfz that i just bought glows all the way to the exhaust. its not as read after 6 inches but it still glows. i just put a jet kit in which i assume that i am not that lean. Could it be the valve that need to be adjusted? since it is so red. I just have never seen such a hot pipe before.

[ajd187]

As i have read the forum, i was wondering if the whole pipe glows are is it just red for 6 inches. the 06 yfz that i just bought glows all the way to the exhaust. its not as read after 6 inches but it still glows. i just put a jet kit in which i assume that i am not that lean. Could it be the valve that need to be adjusted? since it is so red. I just have never seen such a hot pipe before.

If it runs OK don't worry.

You can't gauge these things by red pipes - it happens with all of them.

[zookeeper]

As i have read the forum, i was wondering if the whole pipe glows are is it just red for 6 inches. the 06 yfz that i just bought glows all the way to the exhaust. its not as read after 6 inches but it still glows. i just put a jet kit in which i assume that i am not that lean. Could it be the valve that need to be adjusted? since it is so red. I just have never seen such a hot pipe before.

You're not the first one to be horrified by a glowing pipe. They all do it, and mine will glow all the way to the heat sheild if I let it idle for very long. If you're doesn't glow, then I would be concerned.