This manual covers the 1990 Yamaha 90ETLD outboard motor, a 90 horsepower marine propulsion unit designed for reliable performance on the water. Yamaha is renowned for its engineering quality and the 90ETLD exemplifies this commitment to durability and efficiency, making it a trusted choice for various marine applications. Its robust construction and thoughtful design ensure consistent operation and longevity, providing boaters with the confidence they need for their aquatic endeavors. The purpose of this comprehensive Factory Service Repair Maintenance Manual is to provide detailed guidance for the proper maintenance and repair of your Yamaha 90ETLD outboard motor. It includes step-by-step instructions, detailed wiring and circuit diagrams, illustrations, photos, and exploded views to assist with diagnostics and repairs. Coverage extends to essential areas such as general information, fuel system, power unit, lower unit, bracket unit, electrical system, and troubleshooting, empowering owners, mechanics, and technicians to keep the outboard motor in optimal working condition.