The Yamaha 90A Outboard is a powerful marine engine designed for reliable performance on the water. With a nominal output of 90 horsepower, this internal combustion engine is engineered for durability and efficiency, making it suitable for a variety of boating applications. Its robust construction and advanced design ensure dependable operation, providing boaters with confidence in its capabilities for both recreational and professional use. This comprehensive Service Repair Workshop Manual provides full service and repair instructions for the Yamaha 90A Outboard. It covers essential areas including general information, detailed specifications, periodic checks and adjustments, fuel system, power unit, lower unit, bracket unit, and the electrical system. The manual includes step-by-step instructions, diagrams, illustrations, and wiring schematics to assist owners, mechanics, and technicians in performing maintenance, troubleshooting, and repairs accurately and efficiently.