This service manual covers Yamaha 4-stroke outboard motors manufactured between 1995 and 2004, encompassing a wide range of models from 2.5HP to 225HP. These engines feature robust engineering designed for reliability and performance across various marine applications. The manual details engines with 1-6 cylinder and V6 configurations, addressing both carbureted and Electronic Fuel Injection systems, ensuring comprehensive support for the diverse Yamaha outboard lineup. This comprehensive English-language guide provides essential information for the maintenance, service, and repair of your Yamaha outboard motor. It includes detailed step-by-step instructions, exploded views, and coverage of routine maintenance such as tune-ups, lubrication, and cooling system service. Furthermore, the manual offers in-depth guidance on powerhead, lower unit, trim and tilt, remote controls, and starter system service, along with extensive troubleshooting for electrical and ignition systems, empowering owners and technicians to keep their engines in optimal condition.