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2006 KX250F and 2001 YZ250 2 stroke jetting for altitude

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Hi guys,


First of all I am new here and very new to the dirt bike scene hence this last minute question.


I own a 2011 YZ450F and I am going riding with some friends this weekend in Taylor park Colorado. My bike will be fine seeing as thought it has fuel injection. My other 2 friends, one has a 2006 KX250F and the other fried has a 2001 YZ250 2 stroke. We are all pretty new to this but do enjoy having some fun once in a while.


So about a year ago I took the one friends yz250 with my other friends kx250F to Taylor park which altitude is about 7500 - 10000ft and the bikes ran like crap!. The 2 stroke ran better than the 4 stroke but both bogged and had almost no power at all. We are getting ready to again and I was honestly hoping someone could tell me what jets we would need for these two bikes at this altitude?


Any help would be greatly appreciated.

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Depends on too many variables to 'guess' what they will need.

Current jetting?

Fuel/oil ratio for the 2S?

Modifications from stock?

Current air density?

Expected air density? Altitude means next to nothing.

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