Jet chart for altitude and temp

Discussion in 'Big Bikes' started by doogiebares, Apr 12, 2005.


  1. doogiebares

    doogiebares Rookie DRN Member

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    My friend has a Husky 360 and I ride a YZ250. We have different carbs and he has a neat little chart that shows which jets for different altitudes and temps. Is there such a chart for my 1994 ZY250 with a Mikuni carb? My book doesn't show anything. I have searched here and everywhere else, but can't find a neat chart.



  2. Tom Cox

    Tom Cox Rookie DRN Member

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    Don't give up hope.

    What you're asking for does exist. I've got it some where. Used it when I was preparing to go to Colorado in 1993. I'll look for it and before I respond I'll check to see if some one else provided you with the info. If you're just concerned about going from a lower altitude to riding at 10 to 12,000 feet, a rule of thumb is to reduce your jetting 10%. It works and gets you in the ball park. I live at 500 ft and took my KDX to the mountains this past year and didn't change a thing. Never fouled a plug and had plenty of power. In 1993 I reduced the jetting on my 250 KTM and it still ran way to rich. It just depends on the bike.
  3. Tom Cox

    Tom Cox Rookie DRN Member

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