This manual covers the Yamaha 40ESF Outboard Motor, manufactured in 1989. Designed as a reliable and high-quality outboard motor, the 40ESF is engineered for exceptional performance and durability. Its robust construction and advanced features make it a premier choice for a wide range of marine applications, ensuring dependable operation on the water. This comprehensive Factory Service Repair Maintenance Manual provides detailed information essential for the upkeep and repair of your Yamaha 40ESF Outboard Motor. It includes step-by-step instructions, diagnostic procedures, illustrations, photos, and exploded views covering general information, periodic inspections, fuel system, power unit, lower unit, bracket unit, and the electrical system. The manual is designed to assist owners, mechanics, and technicians in maintaining optimal performance and longevity of the outboard motor.