The R1150GS, produced from 1999 to 2003, represents a significant chapter in adventure-touring motorcycle engineering. Building on the legacy of its predecessors, this model features a horizontally opposed twin-cylinder Boxer engine displacing 1130 cc, delivering approximately 85 HP and 98 Nm of torque, driven by a 5-speed manual transmission and shaft drive. Known for its ruggedness, touring comfort, and go-anywhere capability, the R1150GS was engineered with quality and reliability in mind. Optional features like Integral ABS further enhanced its performance and safety, making it a highly regarded machine for diverse riding conditions and long-distance journeys. This comprehensive Factory Service Repair Manual is designed to provide owners and technicians with in-depth knowledge for maintaining and repairing the R1150GS. Covering a wide array of systems including the engine, fuel system, brakes, electrical system, and more, this manual offers detailed, step-by-step instructions equivalent to those used by factory-trained technicians. It facilitates essential procedures such as routine maintenance, diagnostics, troubleshooting, and rebuilding, empowering users to perform repairs effectively and potentially reduce service costs. The manual includes critical technical specifications, wiring diagrams, and information on common wear items, ensuring the longevity and optimal performance of the motorcycle.