Joe, it would have to be either horizontally opposed with one crankpin (even firing every half revolution, but awful balance, as bad as a single) or horizontally opposed with two crankpins (the mechanical balance would be very good but the two cylinders would fire simultaneously and it would sound like a single). I had thought it would be single crankpin, because otherwise it seems senseless to make the thing. However from what it sounds like and what you've said, I take it it must be two crankpins. That way it would only need one reed valve and one crankcase cavity, because both cylinders would suck and blow at the same time as each other. The problem is, all it would be functionally, is a single cylinder engine with improved balance and hence less vibration. Seems an awfully expensive way to get improved balance. It does explain why the twin and the compact in your video sounded the same as each other though.
No wonder the model was dropped, it sounds like a crazy idea to me.
