This workshop service repair manual covers Yamaha 90A Outboard models. Engineered for reliability and performance, Yamaha outboard engines are renowned for their robust construction and efficient operation, making them a trusted choice for a wide range of marine applications. This manual provides comprehensive information to ensure your Yamaha 90A Outboard operates at its peak. This English-language manual is designed to assist owners, technicians, and mechanics in understanding, maintaining, and repairing their Yamaha 90A Outboard. It includes detailed step-by-step repair and maintenance procedures, electrical system diagnostics, wiring diagrams, trouble analysis, and specific tool requirements. With hundreds of pages of detailed diagrams, illustrations, and parts identification, this manual offers complete coverage of the fuel system, power unit, and lower unit, ensuring thorough serviceability.