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The engine should move backwards, but if you let the chain showing there wad up in the sprocket then that will stop it. Problem being to get the chain loose you have to rotate forward a bit to loosen it to come out and if you have the piston firmly locked against the chain you have a very big problem.

Why one always has to keep the chain(s) free while moving the engine around.

You could try to remove the starter to see if somehow you have activated the one way clutch, that might do it too.
 

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Is the cam chain tensioner(s) the rachet type? If so and it has sprung all the way tight it may be locking the chain down too. All chains loose you should be able to turn the engine with any chains held out taut to keep them from rolling up on sprockets to wad up locking engine up.
 
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