Think you would want to know exactly where the problem is before you remove that head. You can look down the spark plug hole or follow it with a stick to confirm the piston is connected and moving up and down. If the rod is broken or disconected you will definately know that just from the racket you'll hear. You need to pressurize that cyl. with air with the valves closed and check for leakage. Burned valves or something stuck (unlikely) in them is what to look for. If you did the wet test and nothing changed it kinda points to the valves. Going to be pretty time consuming leak testing those valves with the head off.
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