The Suzuki GSXR400, also known as the GSX-R400, represents the first generation (GK71B) of Suzuki's iconic sportbike lineage, produced from 1984 to 1987. This model established the performance reputation for the GSX-R series, featuring an inline-4 cylinder, 398cc liquid-cooled engine. Engineered for sport riding, it showcased advanced technology for its time, including dual disc front brakes and a monoshock rear suspension. The GSXR400 is recognized for its track-bred performance and engineering quality, making it a significant entry in the history of sport motorcycles. This comprehensive Service Repair Workshop Manual in English provides detailed information for the Suzuki GSXR400 (GK71B) models from 1984-1987. It covers all essential aspects of the motorcycle, including engine systems, drivetrain, chassis, and electrical systems, with in-depth procedures for routine maintenance, advanced troubleshooting, and component disassembly/reassembly. The manual includes troubleshooting guides, wiring diagrams, torque specifications, and detailed illustrations to assist owners, mechanics, and technicians in maintaining and repairing the vehicle effectively.