Re: Stuck spark plug
Worst case scenario is something dropped into the cylinder. The dead stop on rotation in each direction can also be the carbon coating sheared from the top of the piston. Doesn't take much to stop the piston. Not uncommon to see on an engine that has been dropped hard. Tape a piece of narrow hose to a vac and suck it out. Ive done it a couple times. Maybe you will get lucky. Good luck.
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