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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Why exhaust pipe glowing red

valve settings not correct is usually the problem

Feb 17, 2016 | Red Motorcycles

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Exhaust glows red hot on dr650 after running on idle for about a minute, spark plugs very black/covered in carbon build up. Shouldnt the exhaust only get that hot running lean? surely then plugs would

If the bike is equipped with any kind of catalytic converter, then the extra raw fuel is burning up in the cat causing the glowing hot exhaust, and all that unburnt fuel in the combustion chamber is fouling the plugs.

Mar 06, 2014 | Suzuki Motorcycles

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Exhaust pipe glowing red after 5 minutes of operating

that mean HOT, it could be the screen in the exhaust is plugged or someone has leaned it out to much or your carb is getting block up and causing a lean issue, fix at once either way, if lean it will seize up soon and then not be fixable

Mar 05, 2014 | Homelite Garden

2 Answers

Yamaha xt225 serow front exhaust pipe glows red within 5mins of starting also running rough

Fueling issue running far to lean, choke makes the circuit richer so it will run , lean running causes over heating and serious engine damage if its running red hot, check the plug for white burnt or blistering will show lean running. Compression test to make sure the piston ring and barrel are not damaged over 110psi. Is the exhaust blocked restricted or dented ?

Mar 31, 2012 | Yamaha Motorcycles

1 Answer


most common cause of this is running lean, common reasons are plugged fuel filter, plugged carb, weak fuel pump etc. basically a lack of fuel even If you are handy it can still be difficult to pinpoint

Feb 04, 2011 | 2001 Yamaha YZF-R1

1 Answer


Glows red, wow thats potenional damagaing to the engine. Possibly to lean, check for restrictions in the exhaust.

I get credit when you rate my answer..........Thanks

Dec 02, 2010 | 2001 Suzuki SV 650

1 Answer

Exhaust glows red

sounds like it's running too lean, could be **** in the carb starving it of fuel. remove air cleaner and spray a bunch of carb cleaner in and let it sit overnight, or take carb off and strip it and clean

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!

Mar 19, 2009 | 2003 Husqvarna TE 250

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