The BMW R90, produced between 1973 and 1976, represents a significant chapter in BMW's motorcycle heritage. Available in the standard R90/6 and the sport-oriented R90S variants, these models are powered by a robust 897 cc air-cooled, four-stroke boxer-twin engine, delivering impressive performance for their era. Renowned for their reliability, comfortable ride, and engineering quality, the R90 series was a popular choice for touring and sport riding, building upon the legacy of its predecessors and paving the way for future BMW boxer models. The R90S, in particular, was recognized as a performance benchmark, featuring enhancements like dual front disc brakes and a higher compression engine.

This comprehensive English-language service and repair manual is designed to provide owners and technicians with the in-depth knowledge required for the maintenance, repair, and restoration of the BMW R90. It covers all essential systems, including detailed engine overhaul procedures for the boxer twin, fuel system adjustments, ignition system troubleshooting, transmission and drivetrain service, suspension and steering maintenance, brake system servicing, and electrical system diagnostics. The manual also includes routine maintenance schedules, component-level repair instructions, and crucial technical specifications, enabling users to effectively manage their vehicle and preserve its integrity.