This comprehensive service and repair manual covers Yamaha outboard motors manufactured between 1984 and 1996, spanning a power range from 2HP to 250HP. It details specific models such as the 2 HP (43cc, 2-stroke), 2 HP (50cc, 2-stroke), 3 HP (70cc, 2-stroke), 4 HP (83cc, 2-stroke), 4 HP (103cc, 2-stroke), and 5 HP (103cc, 2-stroke), encompassing both 2-stroke and 4-stroke engine configurations. These engines are renowned for their engineering quality and reliability, making them a trusted choice for various marine applications. This manual provides essential information for both professional technicians and DIY enthusiasts. It includes detailed step-by-step instructions, clear illustrations, exploded diagrams, and troubleshooting guides for routine maintenance and major repairs. Coverage extends to critical systems such as the engine tune-ups, carburetor adjustment, ignition and fuel systems, cooling, lubrication, and lower unit service, including outboard gearcases. By utilizing this manual, owners and technicians can ensure optimal engine performance, extended engine life, and cost savings on repairs.