Re: Resurrecting 1981 9.9 Evinrude
9.9/15hp's made after '76 have CD ignition (black box w/wiring harnesses on starboard side of cylinder head). If yours is an '81, you have no points. You should get a strong blue 3/8" spark from each plug lead using an open-air tester. If you're getting that, and your flywheel key is in place and intact, and you have champion QL77JC4 plugs gapped to .030", and you have proper compression, and if you have the proper fuel/air mixture delivered to the cylinders... You get my drift. If it is a '74-'76 motor, you have a low-tension magneto, w/pointsets and condensers under flywheel and external coils.
I don't know offhand what size socket fits the flywheel nut.
If you're unsure of the year, post the model number.
Good luck!