Well I just learned something today. I didn’t think you were correct with the single pin Ducati crank... but you were. So I looked at a picture of a Honda RC51 crank. I actually have one of those bikes. Never knew it had a single pin crank as well. Weird how smooth Ducatis and RC51s sound when they fire at 270 and 450 degree intervals.
The RC51 was a very nice and underrated bike. I don’t know sales numbers but they seem rare. How stock is yours? I would imagine they sound very good with the right exhaust.