This workshop service repair manual covers Yamaha outboard motors, including models 150A, 150F, L150F, D150H, 175D, 200F, L200F, 200G, and 225D. These engines, ranging from 150 to 225 horsepower, are designed for reliable performance in marine applications. The manual provides comprehensive technical information and service procedures for these robust outboard motor series, ensuring their continued optimal operation. This manual is designed to assist owners and technicians in maintaining and repairing their Yamaha outboard motors. It details essential procedures for periodic inspection and adjustment, as well as in-depth service instructions for the fuel system, power unit, lower unit, bracket unit, and electrical systems. Troubleshooting guidance is also included to help diagnose and resolve common issues, supported by high-quality diagrams and clear instructions.