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Zundapp Motorcycles

Zundapp KS750 Military Motorcycles

German HO Twins of WWII

HO Twin

Horizontally Opposed Twin

Examples include BMW, Zundapp and Douglas HO Twins have conrods running on a common crank, with one on the exhaust stroke and the other on inlet.

Allen Motorcycle Museum
Allen Motorcycle Museum
Private museum in Boston, MA, with many highly collectable vintage motorcycles for sale.