This Service Repair Manual covers Yamaha 25J, 30D, 25X, and 30X outboard motors. These 2-stroke, inline 2-cylinder engines, with a displacement of 496cc, offer a maximum power output of 25-30 HP and are designed for reliable performance on the water. Engineered with precision, these motors feature dual carburetors, a CDI ignition system, and a Forward-Neutral-Reverse transmission, ensuring efficient operation across their recommended operating range of 4500-5500 RPM. Their robust construction and water-cooled system contribute to their durability and longevity in various marine applications. This manual provides comprehensive guidance for the maintenance, repair, and troubleshooting of your Yamaha outboard motor. It details essential procedures for the fuel system, power unit, lower unit, bracket unit, and electrical systems. Included are technical specifications, recommended maintenance schedules, and diagnostic information to assist owners, mechanics, and technicians in keeping the engine in optimal condition. The manual is presented in English, French, German, and Spanish, offering accessibility to a wide range of users.