Ok, thanks everyone for the help. So this morning I pulled the plugs to replace with fresh ones and one was wet. So I pulled the shroud off and found (using my new feeler gauge) that I had one module way off...Old guys with failing eyesight shouldn't work in poorly lit garages.... It now runs much better but still had some stumble when I engaged the mower, so I played with the carb some and it now runs pretty good, I think. Was tough to tell as it was 32° with a couple inches of snow so I couldn't put it under a real load. I'm good with it for now, thanks again.
Glad you got it. Nice work! The method for setting these up is; using a flexible card-stock type material, very similar to a standard business card, or a business card. Simply set the mag/coil unit in position and leave it's 2 mounting bolts loose. Then rotate the flywheel so that its magnet area is directly across from the mag/coil unit. This sucks the mag/coil unit into the magnet. Pull the mag/coil unit away from the magnet, slide in the card stock, and then let go of the mag/coil unit. It get's sucked back down onto the cardstock, creating the perfect gap. Snug up the 2 mag/coil unit mounting bolts, and then rotate the flywheel sufficiently to "eject" the card stock. This process works for any engine or machine that uses magneto style ignition, whether it's a big V-twin, or a little string trimmer.
Pick up some SeaFoam, add quite a bit of it to the fuel tank, and then run the engine with the deck engaged for a few minutes. Shut it down and leave it like that over winter. Continue to use SeaFoam in your fuel, and you may find that after a couple of mowings the carb jets, circuits, and emulsion tube start to clean up, and it runs better/normal. If it currently has old fuel in the fuel tank, I'd drain that, put in a few gallons of fresh, do your SeaFoam thing, and then leave it like that. SeaFoaming old fuel isn't going to do you any favors and you'll have a wrecked $350 carburetor come Spring.
