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The Morbidelli is certainly a top contender -- too bad it didn't make series production. I have seen one, at the Barber museum.For series produced engines, I'd have to go with the later Ariel Square-Four.PhilB
Duc single. So magnificent. Cam
Never owned one of these but always thought the late '60s Triumph Bonnevilles were some of the best looking bikes ever made. Cleaner engine than my Norton.Pete
I'd say this is another contender....1958 Zundapp Citation...now on Bat... https://bringatrailer.com/listing/1958-zundapp-citation/
Zundapp in name only. Built by Horex.