How hot ?
Are the header pipes glowing red ??
Are you sure it's getting too hot ??
I'm not certain on the earlier XT's, but does your bike have an oil cooler ??
Things that make an air/oil cooled bike get really hot.
1) Fuelling. If your carb is incorrectly jetted with too small jets it will cause your motor to run very hot indeed. I've seen bikes with their header pipes glowing bright red within 60 seconds of the motor running because of very bad tuning.
2) Low oil. Your oil is the only coolant your motor has. If you don't have oil, then your motor has no way to cool down.
3)Low oil pressure. Same reason as above. How's your oil pump. Are any of your oil lines blocked ?
4) Idling without moving in hot weather - No airflow over the engine fins/cooler gives your motor little chance to cool down. You should not leave an air cooled bike idling in the heat without moving for longer than a few minutes.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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