Question about 2005 Yamaha WR 450 F

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2005 Yamaha WR 450F exhaust is glowing cherry red

My 05 wr450f is running v hot pops and bangs the exhaust is glowing red hot even on just above tick over have cleaned carb and done what i can it is a usa import im at my wits end

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  • Yamaha Master
  • 43,732 Answers

Hi, Kevin_qui691 and the usual suspects are:
1. Retarded ignition timing.
2. Retarded cam timing.
3. Bent or burnt exhaust valve.
4. Massive air leak.
5. Intake manifold cracked or damaged.
6. Intake manifold seals have failed.
7. Wrong heat range spark plug.
8. Fuel delivery system running too lean.
9. Faulty Map, O2, MAF, TPS, sensors.
10. Faulty advance mechanism.
11. Faulty VOES switch.
12. After market exhaust headers tubing too thin.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
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Posted on May 29, 2017

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Posted on Jan 02, 2017

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  • 1584 Answers

SOURCE: Derestricting 05 model wr450 exhaust

Usually pull exhaust pipe off at cylinder head and remove a restricting device there.

Posted on Dec 01, 2009

sisadsl
  • 1508 Answers

SOURCE: Glowing RED exhaust pipe

try a bigger jet or its going to cause some damage. You can pull the choke on to get some more fuel in to cool it .
Check that the cam timing hasnt been played with, some change the exaust cam by a tooth to copy yz specs, on top dead centre, there is a little arrow on each cam that lines up with the rocker cover surface

Posted on May 18, 2010

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