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Looks like it was ran with maybe no coolant in it at all?

Or do you by chance have an Epoxy Ported head? I know with Low coolant it can cause similar damage. Epoxy Port jobs fill not only the port roof but the rear water transfer ports are filled with epoxy to strengthen the port floor of the 04-05 TRX450R heads when they get CNC ported... Looks like maybe that can be the case that it was ran really hard and not much water was able to flow from the head down the back of the cylinder water jackets due to it being Low on Coolant.
 
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