The BMW R80 GS and R100 R, produced in 1978, represent a significant chapter in motorcycle engineering, offering a blend of robust performance and enduring design. These models, part of BMW's esteemed R series, are characterized by their air-cooled, four-stroke, boxer twin-cylinder engines, with displacements of approximately 800cc for the R80 and 1000cc for the R100. The R80 GS, in particular, is celebrated as the progenitor of the adventure touring motorcycle, designed for both on-road and off-road versatility. Their construction emphasizes reliability and a mechanical simplicity that has cemented their status among enthusiasts and riders seeking dependable, capable machines. This comprehensive Service Repair Workshop Manual provides essential guidance for the maintenance and repair of your BMW R80 GS or R100 R. It covers a wide array of critical systems, including detailed engine specifications, transmission overhaul, drivetrain components, chassis and suspension, and the complete electrical system. Within its pages, you will find step-by-step instructions for routine maintenance, periodic checks, and advanced troubleshooting, all presented with factory-level accuracy and detail. The manual is designed to empower owners, independent repair shops, and skilled enthusiasts to perform necessary work efficiently, ensuring the longevity and optimal performance of these iconic motorcycles.