check the Pistons!!
Had this happen to me last year salmon fishing. Tilting the engine on its WRONG side when a piston is at the bottom of the stroke lets oil get into the piston when tilted on the wrong side. Usual sign is what you described. If you pull the spark plug you will see its covered in engine oil. pull it over a few times with the plug out, put in a new plug, top up your oil, and you are good to go.
I couldn't figure out why I could not pull my engine over, until I pulled the plug and realized that the hydrolic compression of the engine oil in the cylinder had locked the cylinder. Thought it had magically seized. No big deal, now that I know. And now you know too!!
Drewski
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