Question about 2004 Yamaha YZ 450 F

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Yzf 450f `04 exhaust pipe glows red --believe it to be lean burn

From plugged carb or restricted passageway?

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  • Anonymous Feb 06, 2009

    i also have a 2994 yz450f and my exhaust pipie also glows ,is that a problem, if is how do i fix it

  • john16john Feb 07, 2009

    i just purchased this bike im not sure if timming is out or it is carby problems bought it as is exhust glows red hot

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They will all glow red when you let them idle for a couple minutes. The timing is retarded at idle I believe. Once reved up they will cool off. I figure best to give them a little rev once and a while to help prevent this.

Posted on Mar 19, 2009

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And the question is?

Posted on Nov 22, 2008

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My 450f was dripping coolant out the overflow and i looked over and my pipe was glowing red but the bike didnt take long to cool down once i stoped it


has any recent work been dont to the carburetor? sounds like its running lean,which will cause it to over heat and offen the pipe will glow

Jun 20, 2009 | 2003 Yamaha YZ 450 F

1 Answer

Exhaust glows red


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Apr 08, 2009 | 2004 Yamaha YZ 450 F

1 Answer

Very slow to start huskey te 250 on a 53 plate


The engine is water cooled. The exhaust pipe is air cooled. Sitting idle and revving the engine is likely to exceed the cooling capacity of the motionless air. Air needs to flow over the pipe to cool it. If the pipe is glowing red while riding then consider re-jetting the carb. Too lean a fuel/air mixture burns hotter.
Please rate this solution. Thanks!

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