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colorado jetting

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I have a drz 400s with a fmf slip on. I moved to fort collins from monterey,CA. What jet kit or jet do need to run at 5,000 to 9,000ft. I already tried raising the fuel neediel with washers but it is still cutting out.

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Monterey elevation is 60ft.. You went the wrong way with the needle. Raising the needle provides more fuel/richens. That's not what you need for 5k-9k elevation in your new setting.

Is your airbox modified to flow more air than stock?

The DRZ400S comes stock with a 142.5 main jet, 22.5 pilot fuel jet. Is that still what is in it?

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The airbox is stock and stock jets, so if i take the little washers out do you think it would run better? Whats the deal with airbox mod I've heard not to mess with it.Last night I ordered the fmf jet kit to solve my problems

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