Colorado jetting

4 replies to this topic
  • asinine

Posted August 03, 2004 - 06:43 AM


Does anybody have any high elevation jetting experience with a 450? I'm taking my '04 to Colorado next weekend (hopefully it will be about 40 degrees cooler than Arizona) and the guys I'm going with are saying that it will be 7000 - 12000 feet. The air box has been opened up and I have a Q on it. Currently I'm running a 168 main, 48 pj, and 4th slot from the top on the factory needle.

Thanks in advance for any suggestions.


  • FTD

Posted August 03, 2004 - 06:46 AM


I'm running 38/160 2nd position at 5-10,000 ft. Not sure if it is different for the 450.

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  • Indy_WR450

Posted August 03, 2004 - 12:03 PM


You want to run 155 main, JD red #3, 45 pilot, 70 PAJ, 65 starter jet. at 80 degrees and 8,000 - 10,000 feet.
Soon as it cools down below 70 degrees run 160 main, JD red #4, 48 pilot, 72 starter jet.

  • asinine

Posted August 03, 2004 - 12:31 PM


Thanks for the information Indy and FTD. I'll keep an eye on the temp. next week and make a final decision then.


  • comp182

Posted August 04, 2004 - 02:47 AM


I have an 02 426 the with the JD kit. Would you recomend 155 for my bike as well???


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