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Sounds like the piston seized. The whole job can be done in under an hour but the cylinder is probably damaged so it'll need repair or replacement.
Drain the coolant, pull the exhaust, the radiator and the cylinder head and cylinder. I'd bet you find gouges and melted/welded rings on the piston. You may need a hammer to get it apart too.
Measure the damage to the cylinder, this will dictate whether you need to replace/re-plate or just hone it. Then, you get the piston kit to match the bore size you end up with.
If the piston/cylinder is intact, and it still won't spin, the crank/rod will need a rebuild.
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