wr 400 red hot pipe?!?! (picture)

6 replies to this topic
  • KYKID69

Posted October 16, 2009 - 01:26 PM


Posted Image :bonk:

this is my pipe after running for only a minute or two. anyone ever have a problem like this? i've never noticed it until my last ride...


  • crf250r_motorhead

Posted October 16, 2009 - 01:41 PM


looks cool ehh?

was there a temperature change when you noticed it first?

usually a half turn out on the a/f screw will take it right away.

its going to do it no matter what if you let it idle for a period of time.. these bikes arent meant to idle

  • KYKID69

Posted October 16, 2009 - 03:30 PM


yeah, i just noticed it since it has gotten colder outside. I will try adjusting the a/f screw. thanks

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  • ears2244

Posted October 16, 2009 - 03:34 PM


CR250 R motorhead is right, never let a 4 stroke sit and idle for any amount of time. I had a WR and mine did that and it was a little lean. A few adjustments and it was fine.

  • KYKID69

Posted October 16, 2009 - 03:40 PM


oh really, I wasn't aware of that. So I shouldn't let the motor idle and warm up after first starting it?

  • bakeyz426f

Posted October 16, 2009 - 04:36 PM


only for a minute or so at most or it could overheat. 45 seconds should be good

  • Krannie McKranface

Posted October 16, 2009 - 06:07 PM


If that was taken without a flash, you have an extreme lean condition. I would check your jetting asap.


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