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Sorry Craig; I’ve been out of town.
Well; you’ve made progress. It seems that a binding gearcase is not your issue. I would re-visit whether the engine is firing on both cylinders or just one. Normally one would do that by disconnecting the spark plug wires one cylinder at a time and see if anything changes. But I would NOT do it that way on your engine because of the issues it could cause with the electronic ignition. NEVER rope over or run the engine with either of the wires disconnected from the spark plug.
You could use one of the digital thermometers and measure the cylinder head temp top and bottom….or just feel the temp with your hand.
Or…you have a lean fuel mixture. Re-do the carburetor. See if that helps.
Chuck