This manual provides comprehensive service and repair information for the 1990 BMW R90 motorcycle. The R90 series, produced from 1973 to 1976, is recognized for its premium touring and sport capabilities, featuring BMW's signature air-cooled boxer twin engine and reliable shaft drive. Known for its distinctive engine layout and comfortable ergonomics, the R90 was a premium offering in its era, competing with models from Honda, Yamaha, Kawasaki, and Moto Guzzi. The model's engineering quality and reliability are hallmarks of BMW Motorrad's heritage, making it a sought-after classic.

This service and repair manual is designed to assist owners, mechanics, and technicians in maintaining and repairing the BMW R90. It covers all essential aspects, including detailed engine overhaul procedures for the Boxer engine, fuel system servicing, ignition system maintenance, transmission and drivetrain care, brake system servicing, suspension and steering adjustments, and the electrical system. The manual also includes routine maintenance schedules, troubleshooting guides for common issues, component overhaul instructions, and precise technical specifications and tolerances. Its comprehensive scope ensures that users can effectively perform everything from basic upkeep to complex repairs, ensuring the longevity and optimal performance of their motorcycle.