Ty, it looks as if there must be a cam inside the crankcase to operate that contact breaker via a plunger, something like the pre-1982 Briggs arrangement. I don't know if I like the tiny laminated steel wheel being used to generate electricity for the magneto - it would have a low surface velocity when trying to start the beast, and that might mean a weaker spark just when you don't want a weak spark. However I don't see any signs of fuel having found its way into the electrical enclosure, and that is a good thing.
