This comprehensive service and repair manual is specifically designed for the 1978 BMW R90 motorcycle. It provides detailed instructions and technical specifications for every aspect of maintenance and repair, ensuring you have the knowledge and guidance to keep your classic motorcycle running smoothly. From routine servicing like oil changes and filter replacements to more complex tasks like engine rebuilds, transmission overhauls, and electrical system troubleshooting, this manual covers it all. With clear diagrams, step-by-step procedures, and detailed explanations, this manual empowers you to tackle any repair with confidence, ensuring your BMW R90 remains in top condition for years to come.

The BMW R90, produced from 1973 to 1978, embodies the classic era of air-cooled, shaft-driven motorcycles. This model marked a significant evolution for BMW, building upon the success of its predecessors while incorporating key refinements. The R90 was powered by a 900cc, horizontally opposed "boxer" twin-cylinder engine, renowned for its smooth, reliable performance and distinctive sound. A four-speed gearbox, coupled with a shaft drive system, provided a classic and robust power delivery, while the telescopic fork front suspension and swingarm rear suspension ensured a comfortable and controlled ride. The R90's design was also notable for its simple, functional aesthetic, with a clean, uncluttered layout and iconic round headlight.

The R90, available in both standard and "S" versions, offered a variety of options to suit different rider preferences. The standard R90 emphasized versatility and comfort, while the R90S, with its sporty styling and higher performance, catered to enthusiasts seeking a more spirited ride. The R90's enduring appeal lies in its combination of timeless design, reliable engineering, and engaging riding experience. Its ability to comfortably handle both city streets and open roads, coupled with its classic aesthetics, makes it a cherished classic for enthusiasts and collectors alike. The 1978 model, specifically, represents a significant year in the R90's production run, featuring refinements in both performance and styling that further enhanced its legacy.