Glowing exhaust header

6 replies to this topic

Posted September 20, 2002 - 06:00 PM


I recently bought a '99 WR400. All stock. I have trail ridden a couple of times and ridden around the yard quite alot. While getting ready for a ride tommorrow, I was warming the engine to check my oil level in a dimly lit garage and noticed the exhaust pipe was glowing orange for the first 4-6 inches out of the head. Normal????? Or should I be looking to rebuild. All fluid levels good, water in radiator flowing.

  • SealClubber

Posted September 20, 2002 - 06:43 PM


Normal. Use the search button in the upper right and most of your questions will be answered by the Wizard, the wonderful wizard... :)

  • Steve_WR400F_#61t

Posted September 20, 2002 - 08:38 PM


Normal! Every new WR/YZ rider seams to ask this question. The head pipe is real thin & the engine develops alot of heat. Not to worry, just the way it is. Wait till you get it real hot on a night ride and see it glowing bright red.

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  • Richard56

Posted September 20, 2002 - 10:24 PM


They're right bro... it is very normal...

  • ISBB

Posted September 21, 2002 - 06:35 PM


a night ride in the middle of glamis... racing up and down oldmobile hill competition hill china wall... then sitting at the olds double just chillin watchin the people for a few min... my friend walks over and lights a cigarette off my glowing header... it was cherry red... everyone was tellin me YOUR BIKE RUNS TOO LEAN... im like can it its a 4 stroke thing u twin cylinder two smoke junkies...

  • millertyme

Posted September 22, 2002 - 11:44 AM


I just went on a nite ride last nite and was wondering the same thing, the bike runs great so I wasn't to worried.

  • yamaharider

Posted September 22, 2002 - 05:24 PM


Thanks for asking the question.
I was wondering the same thing about my '99 WR400 and have seen the same thing on my '83 XT 550. I think Yamaha must retard the timing for the first 60 seconds after the bike is started causing the exhaust to heat up.


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