The Yamaha FZR400, produced between 1986 and 1994, is a distinguished sportbike renowned for its engineering quality and spirited performance. As part of Yamaha's legacy in sportbike development, the FZR400 often featured advanced technologies for its class, including the Genesis engine design and Deltabox frame. This model was primarily manufactured in Japan and made available globally, catering to enthusiasts seeking a capable and engaging riding experience. Its inline-four, DOHC, 16-valve, liquid-cooled engine, typically displacing 399 cc, delivered approximately 50-60 horsepower, making it a strong competitor in the 400cc sportbike segment, often compared to models from Honda, Suzuki, and Kawasaki. This comprehensive service manual provides full repair coverage for the Yamaha FZR400, serving as an authoritative resource for owners and technicians. It details essential maintenance procedures, including routine service intervals for oil changes, filter replacements, and chain care, alongside fluid specifications for engine oil, coolant, and brake fluid. The manual also offers in-depth troubleshooting guidance, step-by-step repair and rebuild procedures for all major mechanical and electrical systems, and clear diagnostic information for common issues such as carburetor performance and electrical gremlins. Detailed diagrams and expert-level technical instructions are included to ensure the longevity and optimal performance of your FZR400.