This service repair manual covers Yamaha Outboard Motors from the 2001 model year, encompassing a wide range of engines from 25 HP to 250 HP. These marine engines are engineered for reliability and performance, offering both 2-stroke and 4-stroke technologies across various models. This manual provides comprehensive information for a broad spectrum of outboard motors, ensuring owners and technicians have access to detailed guidance for their specific Yamaha marine power unit. The purpose of this extensive English-language manual is to serve as a definitive resource for maintenance, repair, and troubleshooting. It includes detailed assembly and disassembly instructions, scheduled maintenance procedures, diagnostic protocols, and high-quality exploded views and schematic diagrams. This manual is designed to assist Do-It-Yourselfers and professional technicians alike in effectively maintaining and repairing their Yamaha outboard motors, ensuring optimal performance and longevity.