This comprehensive service and shop repair manual is specifically designed for the Yamaha Outboard 1990 115 hp V4 (1730cc) 2-stroke engine. It delves into every aspect of your engine, providing detailed instructions and illustrations to guide you through any repair or maintenance task, from routine oil changes to complex transmission replacements. This manual is your one-stop resource for understanding and addressing any issue your engine might encounter. The easy-to-follow instructions, accompanied by numerous illustrations, will empower you to confidently diagnose and resolve any problem. You'll find a wealth of information, including step-by-step procedures, exploded diagrams, troubleshooting tips, and component specifications, all presented in a clear and concise manner. This manual is an invaluable tool for any owner looking to perform their own maintenance and repairs, ensuring that you have the knowledge and confidence to keep your engine running smoothly.

The Yamaha 115 hp V4, a stalwart of the 1990s boating scene, is a 2-stroke outboard motor that embodies the raw power and simplicity characteristic of that era. This 1730cc engine, with its iconic V4 configuration, delivers a robust 115 horsepower, making it a popular choice for a diverse range of boats, from sleek runabouts to sturdy fishing vessels. The 115 hp V4 is renowned for its reliability and durability, features that were built into every aspect of its design. The engine, with its sturdy cast-iron cylinders and robust crankshaft, is known for its ability to handle demanding conditions, while its simple, yet effective, lubrication system contributes to its long-lasting performance. Despite its age, the Yamaha 115 hp V4 remains a cherished and sought-after engine among boating enthusiasts. Its ability to provide reliable power, coupled with its relatively straightforward maintenance requirements, has cemented its reputation as a dependable machine. However, the 2-stroke nature of this engine, while offering an intoxicating blend of power and responsiveness, does come with a few drawbacks. Its fuel efficiency is notably lower compared to modern 4-stroke engines, and it also produces higher emissions. These factors have contributed to the decline of 2-stroke engines in the modern boating world, but the Yamaha 115 hp V4 continues to hold a special place in the hearts of those who appreciate its raw, unfiltered power and the distinctive sound of its exhaust note. While its production has ceased, the legacy of the 115 hp V4 continues to live on through dedicated owners who meticulously maintain and cherish these iconic engines.