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Motor seized!

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Help guys! Need advice. Was riding the desert 100 in vantage washington over the weekend and my 01 wr400f made a horrible metal screech and then locked up. The weird thing here is that the next day it broke loose and fired up. Any ideas to this one? I realize I should tear it down but wanted some help in cause. Oil and water were good and clean. 1200 total miles on motor.

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Ouch!

It sounds like the piston got too big for the cylinder, and locked up! Then, when it cooled down, it got "unstuck". I would check the piston, cylinder, the coolant (does it smell burnt?) and cooling system (water pump). You'll probably need rings, and a quick hone to the cylinder.

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