This manual covers the BMW R90 motorcycle, a model known for its robust engineering and enduring appeal. While the R90 series was primarily produced in the mid-1970s, this documentation pertains to a 1988 model year, potentially reflecting later variants or a focus on the continued relevance of R90-era technology. BMW motorcycles of this period are celebrated for their reliable air-cooled boxer-twin engines, shaft drive, and excellent build quality, making them ideal for both touring and everyday riding. The R90 series, including its variants like the R90/6 and the sportier R90S, represents a significant chapter in BMW's rich motorcycle heritage, offering a blend of performance and comfort that has cemented its status as a classic.

This comprehensive service and repair manual provides detailed guidance for the full spectrum of maintenance, repair, rebuild, and restoration tasks. It covers all major systems, including the engine, transmission, chassis, braking, and electrical systems, offering in-depth procedures for assembly, disassembly, tuning, and diagnostics. Whether you are performing routine oil changes, complex engine rebuilds, or intricate electrical troubleshooting, this manual is an indispensable resource. It empowers owners and technicians with the knowledge necessary to maintain the R90's performance, reliability, and longevity, ensuring this iconic machine continues to provide a superior riding experience.