Not to be a smart A, but are you sure the key is not sheared. Are both key grooves perfectly lined up. If the key is not sheared, you are going to have to pull the side cover and check the timing marks on both the crankshaft and camshaft. If you need two hands to pull the engine over, either the valve timing or ignition timing is off. Easier to pull the flywheel and check the key, than pull the side cover.