This manual covers the Yamaha 55 HP Outboard, a 2-stroke, inline 3-cylinder outboard motor with a displacement of 70.1 cubic inches (1150 cc). Produced between 1984 and 1996, this engine delivers 55 horsepower and operates within a full throttle RPM range of 4500-5500 RPM. It features a Forward-Neutral-Reverse gearcase with a typical 2.33:1 gear ratio and is water-cooled. Engineered for reliability and performance, this Yamaha outboard is designed for a variety of marine applications. This comprehensive Service Repair Manual in English provides detailed information essential for the maintenance, repair, and troubleshooting of your Yamaha 55 HP Outboard. It includes specifications for engine components, lubrication requirements, fuel and ignition system details, electrical system information, and propeller recommendations. By following the procedures outlined within, owners and technicians can ensure optimal performance and longevity of the outboard motor.