I posted the first power head pictures before I had removed this other cylinder. When I pulled it back there was a piece of the back fire suppressor sticking out. There was just enough of it remaining to keep it from going into the crankcase. This, and water pump key, would seem to indicate this motor had a death wish. Rings, same as the other side. Freed up pretty easily except for the top ring. Stuck in the area of the exhaust port. I broke it however. Except for having around .005 to .006 of taper, the cylinders look to be in good condition. With all this carbon I’m surprised there is 0 scoring of the pistons or cylinders.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.