This manual covers the Yamaha 2.5hp 4-stroke outboard motor models manufactured between 2003 and 2008. These outboards are recognized for their reliable performance and efficient operation, making them suitable for a variety of small watercraft applications. Engineered with Yamaha's commitment to quality, these engines offer dependable power and user-friendly features designed for recreational boating. This comprehensive Factory Service Manual provides detailed information for the complete engine maintenance, service, and repair of your Yamaha 2.5hp outboard. It includes step-by-step procedures, assembly and system illustrations, diagrams, exploded parts views, and high-quality pictures. The manual covers essential areas such as specifications, rigging, fuel and cooling systems, engine and lower unit maintenance, electrical components, and troubleshooting guidance, ensuring that owners and technicians can effectively maintain and repair the motor.