This service repair manual covers Yamaha F20A, F25A, and F25X outboard motors. These motors are engineered for reliability and performance, making them a trusted choice for a wide range of marine applications. This manual provides comprehensive information to ensure these outboard motors operate at their peak efficiency and longevity. The purpose of this English language manual is to provide detailed guidance for the service and repair of the specified Yamaha outboard motor models. It includes essential information on general operations, specifications, periodic maintenance, fuel and power systems, lower and bracket units, electrical systems, and troubleshooting. With this manual, owners, mechanics, and technicians can effectively maintain and repair their Yamaha outboard motors, ensuring optimal performance and safety on the water.