Over the last few days I've been taking apart the S90 engine Ralph gave to me.
Piston is dirty and cilinder looks a bit shabby, but I won't be using those for this engine, will be cleaned and preserved as spare parts.
All taken apart, no real disturbing finds, just an old engine that has regular wear. I think the center casings had never before been taken apart as they were stuck together as if they were glued.
Only weird thing was a broken gear shift drum, the missing piece has not been found yet, a previous owner probably took it out.