The Lisle impact driver took down four more stuck screws: one on the points plate and all three baseplate screws. That makes it Lisle 10: Stuck Screws 2.
The baseplate was welded onto the cylinder head by the old gasket. I had to delicately hammer a screwdriver tip all the way around the top until I could gently pry it off.
Managed to take a chunk out of one of the head cover cooling fins with an open end wrench. Learned a good lesson... two actually. First, they always tell you to be careful what your hand may hit if the bolt you're trying to loosen suddenly comes free - but same goes for the wrench itself. Second, the age-old advice: use the right tool for the job. I should have just used a socket wrench to pop these off instead of the open end wrench.
It only occurred to me later that evening that the S90 shouldn't actually have a skid plate. I'm not actually sure what model bike this is from, though it's obviously made for a 90cc engine as it even has a cut out for the oil drain. But the S90 also has some knobby tires, so it looks like the last active owner had turned it into something of a make-shift Scrambler.
Camshaft seems ok.
Some debris on the piston, but what surprised me was how little carbon build up it had, especially compared to the CM91. Either the last active owner just kept it in tip-top shape, or maybe it never ran that often...
Same deal on the combustion chamber...
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