From 500ft elev to 6000ft elev jetting?

Going uphill about a MILE in a couple months. So we have a 10 and 09 YZ 450. What kind of jetting should I use? Or would just adding some U-4 to gas or running it straight take care of elev change?

I go from 2500 to 9000 sometimes. Jetted spot on for down low and then I turn the fuelscrew when elevation gets up (on the 09 of course).

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