08 WR450F Jetting


2 replies to this topic
  • sniperjaggi

Posted March 26, 2009 - 11:11 AM

#1

I have modified my exhaust, will remove the smog pump (TT AIS removal kit). I am putting the shorter throttle stop screw in. What should I jet this bike for riding elevations 3,000-8,000 feet? I read a lot of threads about jetting and found many dealing with the YZF or the WR250, but not many about the WR450. From what I did read I found the following suggestions.

Stock
170 main
42 pilot
70 leak

Yamaha GYTR Kit
165 main
48 pilot
90 leak


Any suggestions? If I buy the GYTR kit am I good to go? Any other suggestions?

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  • erickdj

Posted March 26, 2009 - 01:50 PM

#2

I have modified my exhaust, will remove the smog pump (TT AIS removal kit). I am putting the shorter throttle stop screw in. What should I jet this bike for riding elevations 3,000-8,000 feet? I read a lot of threads about jetting and found many dealing with the YZF or the WR250, but not many about the WR450. From what I did read I found the following suggestions.

Stock
170 main
42 pilot
70 leak

Yamaha GYTR Kit
165 main
48 pilot
90 leak


Any suggestions? If I buy the GYTR kit am I good to go? Any other suggestions?


Check the wr450 jetting database, those jetting specs you listed are way off.
Start here: http://www.thumperta...650#post6128650


The GYTR kit is good if you want to remove the AIS pump, otherwise buy your own hand picked jets, since the jets in the kit are usually too rich anyway and you'll end up buying other jet sizes.

  • sniperjaggi

Posted March 27, 2009 - 07:38 AM

#3

Thanks for the information. Looks like what I was looking for. I am ripping off all the smog junk and other restricting crap so I will likely buy the GYTR kit because that is what it is made for. I will keep track of the thread you sent me so if I need to make adjustments I will. Thanks again.




 
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