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250sxf locked up help


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So I just fully rebuilt my 05 250 sxf( crank, bearings, cylinder, piston). Had a mechanic out the bottom end together then I assembled the top. Kicked it over 3 times today and it felt very smooth then it locked up when the piston neared tdc. So I then disassembled the top end searching for what could be the problem to find nothing out of the ordinary.

After taking the cylinder off I realized I can push the piston downward and rotate the crank backward maybe 1/8 turn before it comes to a sudden stop. I can then at that pt kick it over a small amount intill it comes to a sudden stop again (very close to tdc). So in other words the crank will still rotate a small amount back and forth before locking up.

I am lost on this one....

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