This comprehensive BMW R80, R90, and R100 Repair Service Manual provides detailed technical information specifically for the 1991 model year. The manual is designed to support professional technicians, offering a wealth of technical data and step-by-step procedures for various repair and maintenance tasks. Covering a comprehensive range of topics, this manual is a valuable resource for anyone seeking to understand the intricacies of these classic BMW motorcycles. The manual includes detailed diagrams, illustrations, and specifications to guide users through a wide range of procedures, from basic maintenance to complex engine overhauls. It is a vital tool for anyone involved in the restoration, repair, or ongoing maintenance of these legendary motorcycles.

The BMW R80, R90, and R100 motorcycles, produced between 1977 and 1996, are legendary air-cooled, boxer-twin engined machines, renowned for their rugged reliability and timeless design. These models were the backbone of BMW's motorcycle production during the 1980s and early 1990s, offering a blend of classic styling, exceptional handling, and a satisfyingly visceral riding experience. The "R" designation in their names signifies their "Roadster" classification, emphasizing their suitability for both everyday commuting and spirited touring. The numerical designation, 80, 90, and 100, refers to their respective engine capacities in cubic centimeters, indicating a progressive increase in power and performance. The R80, with its 797cc engine, offered a blend of affordability and practicality. The R90, boasting a 901cc engine, provided a step up in performance, while the R100, with its 980cc engine, offered the most power and torque, making it a capable long-distance tourer. The 1991 BMW R80, R90, and R100 models benefited from several updates and refinements, solidifying their position as reliable and enjoyable machines. These updates included improved suspension components, a revised exhaust system for smoother power delivery, and enhanced electrical systems for increased reliability. Notably, the R100 models received a new fuel injection system, which enhanced performance and fuel efficiency while contributing to a smoother and more responsive throttle response. Despite their age, these motorcycles remain highly sought-after by enthusiasts, thanks to their timeless design, unparalleled reliability, and ability to provide a truly engaging riding experience. The 1991 model year, in particular, represents a significant milestone in the evolution of these iconic motorcycles, embodying the pinnacle of their development and desirability. The Repair Service Manual for the 1991 R80, R90, and R100 is a valuable resource for owners and mechanics, offering detailed technical information and instructions for maintaining and repairing these legendary machines.