This manual covers the Yamaha LZ300 outboard motor manufactured between 2004 and 2006. This powerful 300 HP engine features a 3.35-liter displacement, Fuel Injection (EFI), and a water-cooled system, designed for robust performance on the water. Its engineering emphasizes reliability and efficiency, making it a capable choice for various marine applications. The TCI ignition system and oil injection system contribute to its advanced operational design. This comprehensive service manual provides essential information for maintaining and repairing your Yamaha LZ300. It includes detailed step-by-step repair procedures, diagnostic information with troubleshooting guides, technical data such as specifications and tightening torques, and safety precautions with DANGER, CAUTION, and NOTE remarks. The manual is intended for mechanics and DIY individuals, offering pictorial diagrams, exploded views, and photographs to aid in understanding complex procedures, ensuring your engine operates at peak performance.