The K1100LT and K1100RS, produced from 1990 to 1999, represent a significant evolution in motorcycle engineering, building upon the K100 series with an updated 1093cc, 16-valve inline four-cylinder engine. These models are renowned for their robust construction, touring comfort (particularly the LT variant), and performance capabilities, delivering approximately 101 horsepower and 74 lb-ft of torque. The heritage of engineering excellence is evident in the K1100's liquid-cooled engine, shaft drive, and the availability of advanced features like ABS II, making them highly regarded for reliability and a refined riding experience. This comprehensive service repair workshop manual provides in-depth guidance for the K1100LT and K1100RS motorcycles. It covers essential maintenance procedures, detailed troubleshooting, diagnostics, and component-level repair instructions across all major systems, including the engine, transmission, chassis, braking, and electrical systems. With factory-level detail, step-by-step instructions, and clear illustrations, this manual is an indispensable resource for owners, independent repair shops, and professional technicians aiming to maintain, service, and repair these iconic motorcycles effectively and efficiently.