This manual covers the BMW R80, R90, and R100 series motorcycles produced in 1991, including various chassis codes such as R80/7, R80G/S, R80ST, R90/6, R90S, R100/7, R100S, R100RS, R100RT, R100CS, R100GS, R100R, and Monolever variants. These air-cooled, horizontally opposed twin-cylinder boxer engines are celebrated for their robust engineering, durability, and unique character. The R80 models typically feature a 797.5 cc engine, the R90 models an 897.7 cc engine, and the R100 models range from 979.7 cc to 1047.7 cc, offering a spectrum of performance and touring capabilities. Known for their enduring build quality and mechanical robustness, these motorcycles represent a significant part of BMW Motorrad's heritage.

This comprehensive factory service repair manual provides detailed information for the maintenance, repair, and troubleshooting of your BMW motorcycle. It covers all essential systems, including the engine, drivetrain, chassis, suspension, brakes, and electrical components. Within its hundreds of pages, you will find step-by-step instructions for engine overhauls, transmission repairs, brake servicing, and electrical diagnostics, alongside routine maintenance procedures, torque specifications, and required tools. This manual is an indispensable resource for owners and technicians seeking to preserve the performance and longevity of their R80, R90, or R100 series BMW motorcycle.