Not necessarily warped or burned, could also be just plain worn out - or could be oil on the clutch.
Regardless, it has to come apart and get whatever new parts it needs.
The squeaking sound is weird, I'd try to get a mechanic to listen to it or better, ride it. Probably just the clutch, but could be something else - hard to diagnose FOR SURE without hearing it.
How many miles on the clutch/bike?
Are you sure the clutch cable is correctly adjusted? Ir it's tight that will do it. Also, ride it GENTLY so you DON'T overheat and toast the clutch pressure plates.
If it's just the clutch that's worn out, it's relatively cheap. If you toast everything, it's expensive. As soon as the clutch shows signs of slipping you want to drive it very gently to a repair shop and fix asap.
There are some tricks to doing it, so if you don't know what you're doing, check back. You COULD screw it up royally.
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com