This manual pertains to the BMW R90 motorcycle, a model recognized for its robust engineering and enduring performance. Produced during the mid-1970s, the R90 series, encompassing variants like the R90/6 and the sportier R90S, represented BMW's commitment to quality and rider comfort. These motorcycles are characterized by their air-cooled, horizontally opposed twin-cylinder boxer engines and shaft drive systems, offering a distinctive riding experience and a reputation for reliability. The R90S, in particular, was celebrated for its advanced features and sporting prowess, setting a benchmark for its era and contributing significantly to BMW's esteemed position in the motorcycle market.

This comprehensive service and repair manual provides detailed guidance for the maintenance, troubleshooting, and repair of the BMW R90. It covers all essential systems, including the engine, transmission, chassis, and electrical components, offering step-by-step procedures for everything from routine servicing, such as oil changes and valve adjustments, to complete overhauls. With detailed technical specifications, torque values, and diagnostic information, this manual is an indispensable resource for owners, mechanics, and technicians seeking to preserve the performance and longevity of their R90 motorcycle.