This manual covers Yamaha 2-Stroke Outboard motors, specifically models ranging from 150HP to 220HP, manufactured between 1983 and 1987. These robust engines are known for their reliable performance and are designed for a variety of marine applications. Their engineering reflects a commitment to durability and power, making them a trusted choice for demanding watercraft. This comprehensive guide serves as an essential resource for maintaining and repairing your Yamaha outboard motor. It details critical procedures, including general information, routine maintenance, engine removal and installation, fuel and lubrication systems, electrical components, and advanced troubleshooting. The manual is intended for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.