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jetting for CRF450 in Colorado?

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I just bought an 05 CRF450 and rode it in denver at 5000ft with the stock jetting. The bike rips and ran great as far as I can tell. I can't imagine that's the factory recommendations for 5000ft though. I also plan on riding in the high country 6-9000ft. Any suggestions would be greatly appreciated.

Barry

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These bikes will actually run OK at higher altitudes with stock jetting, but nowhere near their potential.

Raise the needle clip one position to lean the midrange, and lean the mainjet 2 sizes from sea level. The fuel screw may have to be turned in 1/8 to 1/4 turn leaner. I lean the main 3 sizes to ride at Rampart, Red Cone, Grand Lake, Woodland Park, etc.

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