05 Wr450

8 replies to this topic
  • Tbone81

Posted July 27, 2005 - 10:22 AM


Just got it and ride between 3000-8000'. I have about 60 miles on it now and have installed an FMF Q pipe, skid plate and radiator guards. It really runs good at the upper rpm level but stumbles mid range (saw the jetting thread and will experiment). I have not cut the grey wire or performed any jetting thus far. Would like suggestions for improvements. This is a really nice bike; I was riding an 87 XR600 and the weight/suspension and acceleration are a lot nicer on the WR.

  • Indy_WR450

Posted July 27, 2005 - 12:35 PM


Try and disconnect your TPS on the left side of the carb and see if your midrange stutter goes away. It only takes a few seconds. If not then rejetting will be necessary to richen the midrange. :applause:

  • SXP

Posted July 27, 2005 - 04:39 PM


Hey Indy - Did you get 490cc by boring only, or did you also stroke? Who did you use. Thanks :applause:

  • Indy_WR450

Posted July 27, 2005 - 06:21 PM


I was going to stroke it with a Falicon heavy stroker crank to a 502 kit but they wanted 10 weeks to deliver it. I had to rebuild her with a standard new crank. :applause:

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  • Tbone81

Posted August 01, 2005 - 07:09 PM


OK disconnected and ran fine but terrible backfire so I reconnected. I was at 8,000 ft plus. It runs OK but the way it ran with the TPS disconnected was great. Just need that backfire to go away.

  • johunter666

Posted August 01, 2005 - 09:02 PM


Spend $65 for the JD jet kit and another $20 for the zip-tie fuel screw. If you like your bike now, you will LOVE it after these mods. Go to the jetting forum to get hints on the setup. :D :D

05 wr450
fmf Q, jd jet kit, zip-tie fuel screw

  • extex

Posted August 02, 2005 - 05:42 AM


Also, remove the AIS. TT sells a plug kit.

  • Dan_Lorenze

Posted August 02, 2005 - 06:48 AM


I'm not sure what main jet you have in there now, but that or the needle position has got to be the culprit (I'm assuming the grey wire is pulled).

  • Dan_Lorenze

Posted August 02, 2005 - 06:49 AM


[quote name='Dan_Lorenze']I'm not sure what main jet you have in there now, but that or the needle position has got to be the culprit, you've got to cut the grey wire too.


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