The Suzuki GSXR400, model code GK71A, produced in 1985, represents an early and significant entry in Suzuki's celebrated GSXR sportbike lineage. This motorcycle is recognized for its agile performance and balanced engineering, embodying the brand's commitment to delivering exhilarating riding experiences. Featuring a robust 398 cc, 4-cylinder, air-cooled DOHC engine, it offered impressive power output for its class, complemented by a 6-speed transmission and a responsive chassis. Its design focused on providing a capable and engaging platform for sport riding, establishing a strong foundation for future GSXR models. This comprehensive Service Repair Manual is designed to provide essential information for the maintenance, repair, and troubleshooting of the 1985 Suzuki GSXR400. Covering all major systems including the engine, drivetrain, chassis, and electrical components, it offers detailed step-by-step procedures, critical specifications, and diagnostic guidance. Whether you are a professional technician or a dedicated enthusiast, this manual serves as an indispensable resource for keeping your GSXR400 in optimal condition, ensuring its performance and longevity through proper care and informed repairs.