Question about Yamaha WR 426 F Motorcycles

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Wr426 getting really hot, header pipe is bright red.

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I would check your coolant first off. Your bike also may be running a little rich (too much fuel) which can cause greater heat. I would try adjusting the little black knob that sticks out of your carburetor, this will adjust your air-fuel mixture. Be careful though, adjusting too much at one time and then riding it hard could damage your bike, i'd adjust it little by little and then ride a bit after each adjustment. See if that helps you work out this problem. good luck

Posted on Nov 20, 2009

  • sharon1981 Mar 14, 2011

    Wrong!!!!!!!!!!!!!!!! if glowing red and geting hot, mixture too lean!!!!!!!! do not lean off any more!!!

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Wrong yamaha wr 426 are known for glowing red

Posted on Feb 07, 2012

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1 Answer

My 2005 450 RMZ exhaust pipe glows red at idle. What size jets do I need at 1000' elevation?


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Hi, Anonymous your motorcycle is a high-performance dirt bike designed to run flat out that being said if you are strolling down some scenic trail at a slow speed or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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2001 yamaha wr426. My bike is running really really hot header pipe is red red hot can anyone please help.... I was told running to lean is this correct also I was told to turn the black knob on side of...


i had a problem with it running hot on idle and went up 2 jet sizes from stock and it made a huge difference it also made the bike start better while hot i had to do a little tuning with that black knob you were referring to but it helped out a lot the next thing you can do is a high out put water pump or dual core radiators that will help out a lot.

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1 Answer

Header pipe turns red hot why is carb. to lean?


Hi, Anonymous a YZ is a motocross bike designed to run flat out that being said if you are strolling down some scenic trail at a slow pace or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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If you have changed the jets you may have to try a different size. I suspect that the pipe is getting red hot from to much fuel . I think your problem is the choke. It may be sticking, have a bad plunger, or may not be closing all the way. Start your inspection there.

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ONLY if you painted it with bright red exhaust heat paint.. get it serviced before you damage your bike,.

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What coud be making my pipe got red hot


Hi, the pipe getting red at the header is caused by the fuel mixture being to lean or the ignition timing being too retarded. Check the induction side of the engine for air leaks and the carburettor for blockages etc. Check the ignition timing.
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