This comprehensive service repair manual covers all Yamaha 9.9hp and 15hp 2-stroke outboard models manufactured between 1984 and 1992. It is an essential resource for anyone looking to perform maintenance, troubleshooting, or repairs on these engines. The manual provides detailed information on a wide range of topics, including general information, periodic inspections and adjustments, fuel system, power unit, lower unit, electrical system, bracket unit, specifications, troubleshooting, and more. Each section is further broken down into numerous subsections, offering in-depth coverage of all aspects of the engine. Additionally, the manual includes numerous detailed wiring and circuit diagrams, illustrations, photos, exploded views, step-by-step instructions, diagnostics, and other helpful information. With its comprehensive content and user-friendly layout, this manual is an invaluable tool for both professional mechanics and DIY enthusiasts.

The Yamaha 9.9hp and 15hp 2-stroke outboard motors, produced between 1984 and 1992, are renowned for their reliability and durability, making them popular choices among boaters seeking dependable power for a variety of water activities. These engines feature a simple yet effective design, incorporating a two-stroke combustion process that delivers power efficiently while remaining relatively lightweight and compact. The 9.9hp and 15hp models share many components, providing a common platform for consistent performance and ease of maintenance. Powered by a robust 2-cylinder engine, these outboards provide ample power for small to medium-sized boats, making them suitable for fishing, recreational boating, and watersports. These engines boast a reputation for their smooth operation and responsive throttle response, making them a joy to operate for both experienced and novice boaters. The 2-stroke design, while requiring a pre-mix of fuel and oil, offers a lightweight and compact solution, contributing to the overall efficiency and maneuverability of the outboard. Yamaha's commitment to quality engineering and robust construction ensures these engines can withstand the rigors of prolonged use in challenging marine environments. The 1984 to 1992 models were further enhanced by improvements in fuel efficiency, reduced emissions, and enhanced reliability through meticulous design and manufacturing processes. These features, combined with their enduring reputation for performance and durability, have cemented the Yamaha 9.9hp and 15hp 2-stroke outboards as a reliable and sought-after option for boaters of all levels.