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up north jetting

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i have a 2002 cr250 and i am going to the cinders this weekend.... Stock main jet is 380. i currently run a 390main and the jetting is dialed perfectly!. How many sizes do you think i will need to go down for the cinders. will i HAVE to change the pilot jet too.? ive heard you can get away with just the main.. I will only be ridding there one day and want to be as dialed as i can befor i get there so i CAN RIDE!! thanks alot!!! help!

by the way, im jetted in and ride at 1000ft. the cinders are roughly 7000ft.

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380 is what we run in Denver at 6,000 feet. Is that the stock needle? Usually 2+ sizes leaner for 6-7,000 feet, like a 360, but that sounds lean.

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im pretty sure its the stock needle and clip. so if you are saying you run a 380 at 6000 feet, are you just leaning out the fule air screw and leaving the jetting stock?! Would that work for me at 7000feet?

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