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Ooohhh not good. ( I have been there before)I hope its not a cylinder ring or a piston pin. Try putting your ear at the spark open holes and turn flywheel again and see if there's is a crunching...

Possibly a broken tooth form the fly whee of the starter and that jammed in the housing cover and flywheel or a tooth off the fly wheel gamed Pull your spark plugs so no compression in cylinders....