The BMW R90, produced between 1973 and 1976, stands as a significant model in BMW Motorrad's history, representing its expansion into larger displacement motorcycles. Known for its robust engineering, shaft drive, and distinctive air-cooled flat-twin boxer engine, the R90 series offered exceptional reliability and touring capabilities. Models such as the R90/6 and the sportier R90S, featuring dual front disc brakes, were praised for their build quality and comfortable ergonomics, making them highly regarded for long-distance riding and a unique alternative to contemporary European and Japanese offerings.

This comprehensive Service and Repair Manual provides detailed guidance for the maintenance, troubleshooting, and repair of BMW R90/6 and R90S models. Covering a wide array of systems including the engine, fuel, ignition, transmission, electrical, brakes, suspension, and chassis, this manual offers step-by-step procedures for everything from routine servicing and adjustments to complete engine and gearbox overhauls. Its extensive coverage, including diagnostic charts and high-resolution diagrams, makes it an indispensable resource for owners, mechanics, and technicians seeking to preserve the performance and longevity of their classic BMW motorcycle.