Yz 400 always over heats

Why??? I've tried jetting it different for my normal altitude then I went way higher and it worked for a day but it's overheating still what else should I try? And I know there is coolants and stuff but I want something more permanent

A little more about when/why/what you're doing when it overheats?

It just always overheats like I get if it's idling but I could be racing through the sand or 3rd gear over trails it still overheats way too much

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