Are you making the assumption of no compressin based on the diagnostics stated here "While running I can disconnect the plug wire on the good side and mower dies". This could be a sign of a bad ignition coil. Check for spark by removing coil wire (spark plug lead) put a new spark plug in it and ground the plug to the engine, crank and look for spark. If you do NOT have compression on that cylinder and the piston is moving, pull the valve cover on that side and look for a valve that is not closing. They can gum up and stay in the open position. When that happens it can also cause the rocker to loose its connection to the push rod because all clearance and tension was lost. You will need to readjust valve clearance.
Regards,
Don
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