This manual covers Yamaha outboard motors, specifically models F80A, F100A, F80X, and F100X, which offer 80 HP and 100 HP power options. These engines represent Yamaha's commitment to engineering quality and reliability, designed for dependable performance in various marine applications. While specific production years are not detailed, this documentation pertains to a range of these robust outboard motors. This comprehensive Workshop Factory Service Repair Supplement & Parts Manual in English provides essential information for maintaining and repairing your Yamaha outboard motor. It includes detailed sections on troubleshooting, electrical systems, fuel system coverage, power unit functionality, and bracket unit details. Furthermore, the manual guides users through periodic inspections, adjustments, and routine maintenance procedures, ensuring optimal performance and longevity of the engine.