This manual covers the 2004 Yamaha Outboard motor, a versatile marine engine designed for a wide range of applications. Yamaha is renowned for its engineering quality and reliability, and this service repair manual provides comprehensive guidance for maintaining and repairing these robust outboard motors. It details procedures for models ranging from 2.5 HP to 300 HP, encompassing various engine types including 2-stroke, 4-stroke (F-series), V-engines, and LZ-series, ensuring support for a broad spectrum of Yamaha's outboard offerings. The purpose of this Service Repair Manual is to empower owners and technicians with the knowledge necessary for optimal vehicle performance and longevity. It contains detailed instructions and high-quality diagrams for servicing and repairing all major systems, including the fuel system, power unit, lower unit, bracket unit, and electrical systems. Coverage extends to periodic inspections, adjustments, and thorough trouble analysis, making it an indispensable resource for any Do-It-Yourself enthusiast or professional mechanic seeking to maintain their 2004 Yamaha Outboard.