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The crank shaft key did not shear, and I forgot to mention that I did get it to run for a second or so a bit later, but had more issues with throttling. the fuel system and coils are fine to my knowledge, and it still seems to have compression, so I do not think it is the oil seals, but I will check that in a few days. I will try new spark plugs and fiddle around with the carb a bit and see if that changes anything. There could be something to be said about the timing, but I do not suspect that the impeller has a vane flipped backwards because the fellow I bought the motor fro seemed to know a LOT more about mercs than I do, which is nothing apart from my limited knowledge of this particular motor. The spark plugs were kinda inconsistent before this, so I still think that is still the issue, but I’ll see how it goes. Thanks for the input.
What I meant to say was that an impeller vane may have flipped backwards while the motor ran backwards for a few seconds, not that a flipped vane caused your running issue. Also, while it seems I have just about the same amount of Mercury knowledge as you do, if your motor is like many OMCs and uses a roller to adjust the amount the throttle butterfly valve is open when the ignition plate is rotated, (to increase or decrease the speed of the engine) then with the cowling off, it might be a good idea to check if the roller falls of the piece it rolls along in the full throttle position. Not sure if that makes any sense, or if that is the way it works on your Mercury.