As a point of trivia, a semi-auto 50, 70, 90, 110 or 125 would be quite similar (if not identical) in the transmission. The only difference is likely in bore and stroke. That may help in your search for pics and vids.
So cool to have a Mechanical Engineer on board!
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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