This manual provides comprehensive service and repair information for the BMW R90, a model renowned for its engineering quality and reliability. As part of BMW's storied motorcycle lineage, the R90, though its primary production run concluded in the mid-1970s, remains a significant machine. This guide is tailored for owners and technicians seeking detailed technical knowledge to maintain and restore this iconic air-cooled, Boxer Twin motorcycle, which features an 897 cc engine, shaft drive, and a 5-speed transmission.

This English-language service and repair manual covers all aspects of the BMW R90, from routine maintenance such as oil changes and valve adjustments to complex procedures like engine and transmission rebuilds. It includes detailed diagrams, torque specifications, wiring schematics, and troubleshooting guides for all major systems, including the engine, drivetrain, brakes, suspension, steering, electrical, fuel, cooling, exhaust, body, and HVAC. The manual is designed to facilitate accurate and efficient repairs, ensuring the longevity and optimal performance of your R90.