This Seloc Yamaha Outboard Service Manual covers models from 1984-1991. It includes information on 1 & 2 Cyl and 2 & 4 Stroke Vol I. The manual is designed to help boat owners maintain their Yamaha outboard motor and keep it running smoothly. It contains detailed instructions and diagrams for all aspects of the motor, from basic maintenance to more complex repairs. The manual is perfect for anyone who wants to save money on costly repairs and keep their outboard motor in top condition. With this manual, you will have everything you need to know to keep your Yamaha motor running like new for years to come. Whether you are a seasoned boat owner or a novice, this manual is an essential tool for anyone who wants to get the most out of their Yamaha outboard motor.