This manual covers the Suzuki GSXR400 and GSX-R400 models produced between 1984 and 1987. These motorcycles represent a significant part of Suzuki's heritage in performance-oriented sportbikes, known for their lightweight construction and agile handling, embodying the early GSX-R philosophy. The GK71B generation features an inline-four, liquid-cooled engine with a displacement of approximately 398 cc, delivering around 53 PS. Notable engineering aspects include a steel twin-spar frame, telescopic front forks, and a monoshock rear suspension, designed to provide rider confidence and a dynamic riding experience. This comprehensive Workshop Service Repair Manual provides detailed instructions for the maintenance, repair, and overhaul of your Suzuki GSXR400/GSX-R400. It covers all essential systems, including engine overhaul, fuel and ignition systems, transmission, chassis, suspension, brakes, and the electrical system. The manual includes routine servicing procedures, troubleshooting guides for common issues, and detailed explanations of component disassembly and reassembly. With its extensive coverage and clear, high-resolution diagrams, this manual is an indispensable resource for professional technicians and enthusiasts alike, ensuring the longevity and optimal performance of your motorcycle.