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yzf 250 jetting for altitude

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going to kennedy meadows with a friend who has a 2002 yzf 250, fmf pipe,jet kit ? manufacture but done in 2003. Any idea how I should set it up for 7500+ altitude.

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Take a known good jetting set up at sea level, and lean the main jet 3 sizes, and raise the needle clip one position leaner. That's a great starting point.

For instance, if you have a 158 main now, go to a 150 (155, 152, 150).

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