Franz Bartisch built a motorcycle powered by an OHC 350cc engine in Vienna in 1925, predating the famed AJS OHC by some years. In 1928 a 500cc machine was produced with enclosed valves, oil-cooled head and sleeved cylinder, and with bevel-driven camshaft replacing the chain-drive of the 350 model. It was certainly one of the most progressive designs of the day.
Both engines were housed in Degen frames.
Sources: Wikipedia.de, Tragatsch p83, et al.
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