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did is sound like a coffee can with marbles in it being shaken around?
if you did several revolutions, (2 complete revolutions would make it cycle through all the strokes at least once), and didnt hear anything i think you are good.
and the hiss you are hearing is normal it is air being forced out the the exhaust valve, which means you have compression.
being hard to turn at once point is the point where the piston is producing the most compression in said cylinder. as far as abruptly stopping when trying to crank... how does your battery fair? should read 12.xx volts on a multimeter.
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