03 450 seized?

Hey guys, I just bought an 03 yz450. It ran great, started first kick. I rode it around the block a couple times. Today I go to start it, and it won't start. Smoke came out of the exhaust. Now it won't turn over. I have rebuilt 2 strokes, so at least if have a little mechanical skill and a few basic tools.

remember,4-strokes dont use pre-mix :lol: ...surely not.  it can only be full of fuel,water or oil. what did the smoke look ,smell like when you kicked it over? any residue in end of pipe? check the plug for clues. reaaly need more info. did the petcock :naughty: get left on...... 

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