May be a valve stuck down
Hi Bob
As for not turning all the way through, don't force it it may be a valve stuck down and hitting the a piston. Check while you turn the engine over by hand to see if the valves are moving up and down on the cylinder that is coming up on stroke. I remove all the plugs when doing this and then use a piece of copper wire bent to slide down the spark plug hole to find which pistons are the highest up, then check the valves on those cylinders.
Cheers Phil
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