This manual covers the 1978 BMW R Series motorcycles, specifically the R80, R90, and R100 models, including chassis codes R80/7, R90/6, R100/7, and R100S. These iconic motorcycles are powered by air-cooled, four-stroke boxer twin-cylinder engines, with displacements ranging from 797.5 cc for the R80 to 979.7 cc for the R100. Known for their robust engineering and reliable shaft drive, these BMWs offer a distinctive riding experience, blending classic styling with enduring performance. The R Series has a rich heritage, representing an evolution of BMW's celebrated boxer-twin design, making them highly regarded by enthusiasts for their durability and character.

This comprehensive service repair workshop manual provides detailed, step-by-step instructions for the maintenance and repair of all mechanical, electrical, and chassis systems. It covers essential procedures such as engine assembly and tuning, transmission and drivetrain servicing, suspension and braking system overhauls, and electrical system diagnostics. The manual also includes troubleshooting guidance for common issues and technical specifications necessary for accurate repairs. Its purpose is to assist owners, mechanics, and technicians in preserving the longevity and optimal performance of their 1978 BMW R Series motorcycles, ensuring they remain reliable and enjoyable to ride.