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Main and slow jet size

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I have two grandsons, one who owns a  2016 CRF50F, and one who owns a 2017 CRF50F. We live in Kansas at an elevation of about 1300 ft. We go to Colorado every year and ride to as high as 12500 feet although average would be closer to 10500 to 11000 ft. My question is to anyone who has jetted on of the smaller bikes........What size main jet did you use and did you go to a different slow jet ? If so what size ?

Thanks in advance for any input you can give.

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The pilot/slow jet on the stock 50 carb is press fit and is not designed to be replaceable.

I will leave to main jet question for guys who live in higher elevations.

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