The BMW R 1150 GS, produced in 2003, represents a significant entry in the adventure touring motorcycle segment. Building upon BMW Motorrad's extensive heritage in motorcycle engineering, this model, codenamed R21, features a robust 1130 cc, air/oil-cooled, four-stroke Boxer Twin engine. Known for its versatility and capability on both paved roads and light off-road terrain, the R 1150 GS is celebrated for its durability and suitability for long-distance travel. Its design emphasizes a balance of performance, with approximately 85 horsepower and 72 lb-ft of torque, and practical features, including a 6-speed manual transmission and shaft drive, making it a highly regarded machine among riders. This comprehensive factory service repair manual provides detailed information for the BMW R 1150 GS (2003). Covering all essential systems from engine and drivetrain to chassis and electrical components, it offers complete factory-level detail suitable for professional technicians and owners alike. The manual includes step-by-step repair instructions, diagnostic procedures for common issues such as Hall sensor or throttle position sensor calibration, and routine maintenance guidelines for oil changes and valve clearances. With its searchable format, detailed illustrations, diagrams, and photos, this resource empowers users to perform servicing and repairs efficiently, potentially saving on labor costs.