Question about 2003 Yamaha WR 250 F

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I have a 2001 yamaha wr250f and after running only a couple minutes the header pipe is glowing orange!! verry hot, what are some of the things that may cause this? thanks Rod.

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  • rodsixfifty Apr 20, 2009

    i am going to check them all asap. i was also just told by a yzf250f motocross racer to check the hot start lever & cable they are verry touchy and will also cause this problem! thanks for the great info, Rod.

  • rodsixfifty Apr 21, 2009

    hi again! i have had and worked on many bikes in the past but i am new to the wr 250. i am going to invest in the repair manuel but what is the correct plug i should be using? it is spring here in nova scotia , canada. average +5 degrees celcius.

  • rodsixfifty Apr 21, 2009

    hey, thanks for all the knowledgeable info! the manual is a great help also, this is a great site. take care, Rod.

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Air leak causing a lean fuel/air mixture, bad radiator cap killing pressure in the cooling system, low water in the radiator, plugged radiator, broken water pump, not using premium gas and a spark plug with the wrong heat range.

Please rate this solution. Thanks rodsixfifty! < cool name

Posted on Apr 20, 2009

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  • tombones Apr 20, 2009

    Your motocross friend is correct. I didn't remember the hot start lever and have now revised my list and added some other possible air leak sources. > >



    An air leak is causing a lean fuel/air mixture. The causes are Hot start lever or cable problems, bad gasket seal on carb, carb manifold, bad head gasket, bad radiator cap killing pressure in the cooling system, low water in the radiator, plugged radiator, broken water pump, bad valves, loose spark plug, automatic de-compressor not functioning properly, not using premium gas and a spark plug with the wrong heat range.

  • tombones Apr 20, 2009

    Add > lean carb jets and pre-ignition, aka detonation and engine knock.

  • tombones Apr 21, 2009

    In Dallas Texas it is 80 degrees Fahrenheit. I just hate wearing tee shirts all the time. :) Tell ya what I'm gonna do; go to the site below and download a free service manual. Now go buy the wife some flowers with the money you save on buying a manual. She will be happy, you will be happier and I will get a top rating for my solution. Deal?



    The stock plug is an NGK CR8E

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Glowing exhaust header yamaha wr250f


It won't be valve timing or clearance. The fuel/air mix would be the culprit. Clean the carburetor with special attention to the idle circuit. Remount the carb with new manifold gaskets. A manifold air leak will mess up the mixture. Also, get a new spark plug one heat range colder than stock. Hope this helps out!

Please rate this solution. Thanks!

Apr 07, 2009 | 2003 Yamaha WR 250 F

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