This repair manual covers Yamaha 2-stroke outboard motors manufactured between 1983 and 1987, specifically the 150HP, 175HP, 200HP, and 220HP models. These robust engines are known for their reliable performance on the water, offering powerful propulsion for a variety of marine applications. Their 2-stroke design ensures a good power-to-weight ratio, making them a popular choice for boaters seeking dependable operation and efficient performance. The purpose of this comprehensive repair manual is to provide detailed guidance for the maintenance, diagnosis, and repair of your Yamaha outboard motor. It includes in-depth information on general procedures, routine maintenance schedules, engine specifications, fuel and lubrication systems, cooling systems, electrical components, and advanced troubleshooting techniques. By following the instructions within this manual, owners and technicians can ensure their outboard motor remains in optimal working condition, maximizing its lifespan and operational efficiency.