Jetting question for 04 WR 450 in Ut 5000ft +


4 replies to this topic
  • RNH

Posted April 03, 2004 - 06:58 PM

#1

Have YZ throttle stop, Air Box gutted, gray wire cut and GYTR exhaust insert. Does anybody have good jetting spec for Utah 5000ft and above.

Thanks

  • jerryls

Posted April 03, 2004 - 09:52 PM

#2

This is a good start:
http://www.thumperta...rue#Post1025909

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • rohar

Posted April 04, 2004 - 09:56 AM

#3

With my 03 with the same set up as yours, I went to a 155MJ and stock PJ and PAJ. I also dropped the clip one position. I used the JD Jetting guide to dial this in. Bascally, this was what I would call a "reasonable" jetting setup. The motor ran good through all throttle ranges and didn't do anything bad or unpredicatable. Likely you will find that the pilot circuit's a bit lean unless the fuel screw is 3-3/12 turns out.

I recently switched to the JD Jetting kit and saw a huge difference in the performance of the bike. Much more responsive and snappy. :)

  • tigerowner_ut

Posted April 06, 2004 - 01:27 PM

#4

Have YZ throttle stop, Air Box gutted, gray wire cut and GYTR exhaust insert. Does anybody have good jetting spec for Utah 5000ft and above.

Thanks


I have the JD jetting kit installed with the 6000 foot setup. Works great. The only thing I would try that is different from the instructions would be to raise the needle one position for the lower altitudes but I have not tried it yet. In the hills mine is perfect but it is a tuch lean in the desert.

  • RNH

Posted April 10, 2004 - 09:16 AM

#5

sounds like the JD jetting kit is the way to go.
Thanks everybody




 
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