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CRF250 jetting for altitude

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I have an 04 crf250r. I live at 1000' in Phoenix and will be going ro 7000' this weekend.

Current jetting as follows

172main

4th clip

42 pilot

2 turns on fuel screw

Any suggestions on what changes to make for altitude?

Is there a rule of thumb like say 1 mainjet size for every so many feet?

Thanks in advance

Steve

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