This manual provides comprehensive information for the 2004 R1150GS. Known for its robust engineering and reliability, the R1150GS is an iconic adventure touring motorcycle, powered by an 1130 cc flat-twin engine delivering approximately 85 hp and 71 lb-ft of torque. Its design emphasizes durability and performance for diverse riding conditions, featuring electronic fuel injection, a 6-speed manual gearbox, and the Integral ABS II braking system. The R1150GS represents a significant evolution in the renowned 'GS' lineage, offering a blend of power, comfort, and capability that has defined the adventure motorcycle segment. This factory service repair manual is meticulously designed to assist R1150GS owners, DIY mechanics, and professional technicians. It covers an extensive range of topics, including detailed maintenance procedures, advanced troubleshooting guides for common issues like Hall effect sensor failures, and step-by-step repair instructions for all major components and systems, from the fuel and electrical systems to the transmission and suspension. With hundreds of detailed illustrations, wiring diagrams, and specific diagnostic techniques, this manual empowers users to perform servicing efficiently, understand complex systems, and maintain their vehicle to factory standards, ultimately saving on labor costs and ensuring optimal performance and longevity.