This manual covers the Yamaha Outboard 90HP motor, produced between 1996 and 2006. Designed for service, maintenance, and repair, these motors are available in 3 and 4 cylinder configurations, with both 2-stroke and 4-stroke, and carburettor fuel system models. The engineering quality and reliability of Yamaha outboards are well-established, making this resource essential for understanding and maintaining these powerful marine engines. This comprehensive Factory Service Repair Workshop Manual provides detailed information crucial for the upkeep of your Yamaha Outboard 90HP. It includes sections on general information, specifications, periodic inspection and adjustment, fuel system, power unit, lower unit, bracket unit, electrical system, and trouble analysis. With work procedures, torque specifications, and exploded views, this manual is an indispensable tool for owners, mechanics, and technicians to ensure optimal performance and longevity of the motor.