This manual provides comprehensive guidance for the FZR400 Fazer, a celebrated middleweight sportbike produced between 1986 and 1990. As part of an innovative era, the FZR400 embodies advanced engineering for its time, featuring a liquid-cooled, DOHC inline-four cylinder engine with a displacement of 399 cc, delivering approximately 52-55 PS. Its design emphasizes performance and handling, characteristic of a commitment to sportbike technology, making it a significant model in its class. This complete service and repair workshop manual is meticulously designed to cover all aspects of the FZR400 Fazer from 1986 to 1990. It details routine maintenance, including oil changes, filter replacements, and brake fluid flushes, alongside in-depth repair and overhaul procedures for the engine, fuel, transmission, braking, electrical, and chassis systems. With step-by-step instructions, detailed exploded diagrams, and essential technical specifications, this manual serves as an indispensable resource for owners and technicians to effectively maintain, diagnose, and repair the vehicle, ensuring its optimal performance and longevity.