OK, I finally gave up on repairing my old engine (11 HP B&S) and found a new 12 HP one (284707, 1026E-1, 030618ZE). This new engine had a a dual circuit alternator and I needed to use the one off my old engine since my mower had an electric clutch. I removed the flywheel (using a steering wheel puller - Thanks for the help Restrorob), replaced the alternator and put everyting back together. I torqued the flywheel nut to 65 ft. lbs using a torque wrench. In my haste to to get the enging back on the tractor, I used an electric impact wrench to tighten the shaft bolt that holds the electric clutch. I heard a "tink". I assumed it was the bolt breaking but everything is mounted solid. I continued connecting all of the wires, etc. When I tried to start it, it wouldn't start. I checked for spark using a spark tester and there wasn't any. OK, I figured the "tink" may have been the flywheel key so this morning, I took the cover back off and checked the key. It looks solid and the groove in the shaft is lined up with the groove in the flywheel. I did not move the coil when I removed or reinstalled the flywheel. Any ideas what the "tink" may have been? What do I need to check to find out why there isn't spark?