This manual covers BMW motorcycles from the R51, R51/2, R61, R66, and R71 series, produced approximately between 1939 and 1951. These models represent BMW's robust engineering and commitment to quality in the pre-WWII and immediate post-war eras, competing with other premium European manufacturers. Known for their reliable shaft drive, distinctive boxer twin engines, and durable construction, these motorcycles were offered in Sport and Touren (Touring) variants, catering to a range of rider needs. Their design philosophy emphasized performance, longevity, and a premium ownership experience, establishing BMW's strong reputation in the motorcycle industry.

This Ersatzteilliste (Parts List/Catalog) is an essential resource for owners, mechanics, and restorers of these classic BMW motorcycles. It provides detailed diagrams and part numbers for all major systems, including the engine, transmission, drivetrain, suspension, brakes, electrical system, fuel system, and frame. The catalog's primary purpose is to facilitate accurate part identification and procurement, aiding in the maintenance, repair, and restoration of R51, R51/2, R61, R66, and R71 models. Its comprehensive component-level breakdown ensures that users can source the correct parts to keep these historic machines in optimal condition.