BMW Twins Mick Walker. Subtitled: The Complete Story. BMW have been producing twin-cylinder motorcycles since 1923. This comprehensive and well-written book tells the full story of BMWÆs one-, three- and four-cylinder machines, but it is their horizontally-opposed twin-cylinder models that have dominated the companyÆs history. Leading motorcycle author Mick Walker covers the full history of the company, paying special attention to the latest four-valve æBoxersÆ which are set to lead the company into the 21st Century. Includes coverage of all road and racing motorcycles used by the military and police. Hdbd., 7 1/4"x9 1/2", 27 pgs., 2 color ill.