Walk Behind Lawn Mowers

I have a Sears self propelled lawn mower with a Tecumseh engine with a solid state ingnition on it. Unfortunately I hit a rock and broke the crankshaft soft key. In replacing the soft key, is there a timing procedure to go thru or do I just line up the keyway in the crank shaft and magneto and it is automatically timed. I understand the air gap between between the mageto magnets and the ingnition modual must be .012 inches. It is at .003 inches. Would this prevent it from showing any spark when I try grounding the plug? Is there anything else that needs attention before I reassemble the engine. Also it does not appear to be getting gas to the cylinder. The spark plug does not get wet when I pull the starter rope.
Thank you, Richard Berardini There is no charge for answers to these questions, is that correct?