The Yamaha 80 HP Jet V4, produced between 1987 and 1996, represents a robust V4 2-stroke Jet Drive generation. Engineered for reliability and performance, this model is designed to meet the demands of various watercraft applications. Its construction emphasizes durability and efficient operation, making it a trusted choice for recreational and professional use. The 80 HP output, combined with the responsive Jet Drive system, ensures capable propulsion across a range of conditions. This Service Repair Workshop Manual provides comprehensive guidance for the Yamaha 80 HP Jet V4. It covers essential maintenance procedures, including oil changes, spark plug replacement, and air filter servicing, alongside detailed troubleshooting steps for common issues. The manual includes in-depth information on the fuel, electrical, ignition, lubrication, and cooling systems, as well as the powerhead, lower unit, and trim and tilt mechanisms. With step-by-step instructions, diagrams, illustrations, and wiring schematics, this manual is an indispensable resource for mechanics, owners, and service professionals to ensure optimal performance and longevity of the engine.