need help with jetting

ive got a 2010 YZ 250 F that's set up for sea level, were going to the qualifier in Colorado next month (6100' above sea level) what jets do I need??? is there anything else we can do to help with any supposed power loss?

Thanks

If the jetting you have now is spot on, then the standard rule of thumb is three sizes leaner on the main, and one clip leaner on the needle. Do you know your current jetting?

i know little to nothing about jetting? never adjusted it, so bone stock, as i purchased it???

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