The Yamaha F20A, F25A, and F25X Outboard models represent advanced four-stroke marine propulsion, featuring fuel injection for efficient operation and digital CDI ignition for reliable starting. These water-cooled engines, with a displacement of 432cc, offer power outputs of 20 or 25 horsepower depending on the specific model. Designed for a range of boating applications, they are engineered for dependable performance and durability on the water, incorporating electric start for user convenience. This comprehensive Service Repair Manual in English provides detailed guidance for the maintenance and repair of your Yamaha outboard. It covers essential areas including general information, technical specifications, periodic inspections and adjustments, fuel system, power unit, lower unit, bracket unit, electrical system, and troubleshooting. This manual is an indispensable resource for owners, mechanics, and technicians, ensuring the optimal performance and longevity of the F20A, F25A, and F25X models through accurate procedures and technical data.