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Fascinating to watch the design develop like this - thanks for sharing!
I believe that the slightly larger 50cc Busy Bee or Bumble Bee was built. Eric is certainly the man with the information.
Really, I didn't find "numerous mistakes" when I modeled everything. The only discrepancy I discovered was in the exhaust port position, both relative to the intake ports and relative to the holes in the liner..
Stroke (throw): 19.05
Must be pretty sensitive on the small CI engines, if you're say 0.25mm out with your port on a 0.8cc diesel it would probably affect the duration quite a bit
I have abandoned this thread because of inconsistencies in the original drawings I worked from, and the realization that I don't really understand two stroke engines well enough