This manual covers the Yamaha 40ELN Outboard Motor, manufactured in 1984. As a 40 horsepower internal combustion gasoline engine, this outboard motor is designed for reliable performance in marine applications. Yamaha is renowned for its engineering quality and commitment to producing durable and efficient marine propulsion systems, ensuring a dependable boating experience. This Factory Service Repair Maintenance Manual provides comprehensive guidance for the upkeep and repair of your Yamaha 40ELN. It details procedures for general information, periodic inspection and adjustments, fuel system, power unit, lower unit, bracket unit, and electrical system. With step-by-step instructions, detailed wiring and circuit diagrams, illustrations, photos, and exploded views, this manual is an essential resource for owners, mechanics, and technicians to perform maintenance, diagnostics, and repairs effectively.