This service repair manual covers the Yamaha 25J / 30D / 25X / 30X outboard motors. These motors are engineered for reliability and performance, offering robust solutions for a variety of marine applications. This manual provides comprehensive information to ensure optimal operation and longevity of your Yamaha outboard engine. The purpose of this manual is to assist owners, mechanics, and technicians in performing all necessary service operations, including repair, adjustment, inspection, disassembly, and assembly. It details the procedures for various systems, such as the fuel system, power unit, lower unit, bracket unit, and electrical systems. With detailed instructions and diagrams, this manual serves as an essential resource for maintaining and troubleshooting your Yamaha outboard motor.