This manual covers the K1100LT and K1100RS models produced in 1999. These motorcycles represent a significant chapter in engineering history, known for their robust four-cylinder, liquid-cooled Boxer engines, shaft drive, and the distinct characteristics of the LT touring variant versus the RS sport-oriented model. The K1100 series, evolving from earlier K-series designs, offered enhanced performance and refinement, making them capable machines for both long-distance travel and spirited riding. Their construction emphasizes reliability and a high standard of build quality, hallmarks of a commitment to producing durable and well-engineered vehicles. This comprehensive workshop service repair manual provides detailed information for the complete service, repair, and maintenance of your K1100LT or K1100RS. It covers all mechanical and electrical systems, from the engine and drivetrain to the chassis, suspension, and braking systems. The manual includes routine maintenance procedures, tune-up guidelines, in-depth repair and rebuild instructions, and diagnostic and troubleshooting guides for common issues. With its dealership-level technical depth and clear, accurate instructions, this manual is an essential resource for owners, mechanics, and technicians seeking to maintain and restore these iconic motorcycles to optimal condition.