This manual covers the K1100LT and K1100RS models from 1998. These premium sport-touring motorcycles are renowned for their distinctive Boxer engine, shaft drive, and comfortable ergonomics, particularly the LT variant. The heritage of engineering excellence, durability, and rider comfort is evident in these models, which feature a liquid-cooled, inline four-cylinder Boxer engine displacing 1093 cc, producing approximately 90-100 hp. Known for smooth power delivery and robust construction, these motorcycles offer a sophisticated riding experience, enhanced by optional ABS II on some models and advanced touring features on the LT. This comprehensive English-language service manual provides full coverage for the service, repair, maintenance, diagnostics, and restoration of your K1100LT or K1100RS. It details procedures for the engine, transmission, clutch, final drive, chassis, suspension, brakes, and electrical systems, including wiring diagrams. The manual guides users through scheduled maintenance, component overhauls, troubleshooting common issues, and detailed repairs, catering to both DIY enthusiasts and professional technicians. Its scope ensures that owners can effectively maintain and preserve the performance and longevity of their motorcycle.