This workshop factory service repair manual provides comprehensive information for Yamaha 25J, 30D, 25X, and 30X outboard motors. These water-cooled, carbureted outboard motors, available in 25 and 30 horsepower variants with CDI ignition, are engineered for reliable performance. This manual covers detailed service and repair procedures, ensuring the continued optimal operation of your Yamaha outboard. The purpose of this English-language manual is to serve as an authoritative guide for owners, mechanics, and technicians. It includes detailed sections on general information, specifications, periodic inspection and adjustment, fuel system service, power unit and lower unit maintenance, bracket unit, electrical systems, and trouble-analysis. With high-quality diagrams and detailed instructions, this manual is an essential resource for maintaining and repairing your Yamaha outboard motor.