This manual provides comprehensive information for the BMW R90 series motorcycles, primarily focusing on the R90/6 model, with coverage extending to related R90 variants from 1973 to 1996. Known for its robust boxer twin engine, shaft drive, and enduring build quality, the R90 series represents a significant era in BMW motorcycle history, offering a blend of performance and touring capability. The engineering excellence and reliability of these machines have cemented their status among enthusiasts and collectors, making proper maintenance and repair crucial for preserving their classic appeal and functionality.

This service and repair manual is designed to be an authoritative resource for owners, technicians, and mechanics. It covers all essential aspects of the vehicle, including detailed procedures for engine overhaul, fuel system maintenance, transmission service, electrical system diagnostics, brake system repairs, and suspension adjustments. The manual also includes routine maintenance schedules, troubleshooting guides for common issues, and essential technical specifications such as torque values and fluid capacities. By providing step-by-step instructions and in-depth technical knowledge, this manual empowers users to maintain, service, and repair their BMW R90 motorcycle effectively, ensuring its longevity and optimal performance.