This manual covers the Yamaha Outboard 100-130 series of gasoline-powered outboard motors. These engines are designed for marine propulsion, offering power output in the 100 to 130 horsepower range. They feature a water-cooled system and a transmission with Forward, Neutral, and Reverse gears. Steering can be either mechanical or power-assisted, and throttle control is available via remote or tiller. This complete official full service repair manual in English provides comprehensive guidance for maintaining and repairing your Yamaha outboard motor. It details essential procedures, technical specifications, and safety information. Owners, mechanics, and technicians will find detailed instructions to ensure the optimal performance and longevity of the engine, covering various aspects of its operation and upkeep.