This comprehensive service and repair manual provides in-depth guidance for Yamaha 70hp and 90hp 2-stroke outboard motors manufactured between 1988 and 1994. It is designed to empower you to perform a wide range of repairs and maintenance tasks on your own, saving you significant time and money. The manual features clear, step-by-step instructions, accompanied by detailed illustrations and wiring diagrams. You'll find thorough coverage of all aspects of repair, from routine maintenance procedures to complex troubleshooting and component replacement. Whether you're a seasoned mechanic or a DIY enthusiast, this manual equips you with the essential information to confidently tackle any repair job. From basic servicing to advanced troubleshooting, this manual is your complete resource for maintaining your Yamaha outboard motor in peak condition.

The Yamaha 70hp and 90hp 2-stroke outboard motors, produced from 1988 to 1994, represent a significant era in the company's history. These engines were renowned for their power, reliability, and durability, making them popular choices for a wide range of boating applications. These outboards featured a robust design with a cast-iron powerhead, offering exceptional longevity and resistance to wear and tear. The 70hp and 90hp models shared many core components, with the difference in power output primarily stemming from the carburetor and ignition settings. Both engines were known for their smooth operation and efficient fuel consumption, making them a reliable choice for both recreational and commercial use. The Yamaha 70hp and 90hp outboards were equipped with a variety of features designed to enhance user experience and performance. The "CDI" (Capacitive Discharge Ignition) system provided reliable ignition and improved starting efficiency. The "Power Tilt" system allowed for easy and effortless adjustment of the engine angle for optimal performance. These engines were also equipped with a "VRO" (Variable Ratio Oil Injection) system, which automatically delivered the correct amount of oil to the engine, ensuring optimal lubrication and reducing the risk of damage. The use of a "Power Trim" system enabled precise control over the engine angle, offering enhanced maneuverability and performance in various water conditions. Despite their impressive features and reliability, these outboards have reached the end of their expected service life and are now considered vintage engines. Maintaining and repairing these older models requires specialized knowledge and expertise, which is why having access to a comprehensive service and repair manual is crucial.