This Service Repair Manual covers the Mercury 40 HP 2-Cylinder Outboard, manufactured between 1979 and 1980. This model features a carbureted, water-cooled 2-cylinder outboard engine delivering 40 horsepower and a transmission with forward, neutral, and reverse gears. Designed for reliable performance, this outboard is engineered to meet the demands of various marine applications. This comprehensive manual provides essential information for the maintenance and repair of your Mercury 40 HP outboard. It details critical procedures, technical specifications, and safety guidelines necessary for proper upkeep. Owners, mechanics, and technicians will find this guide invaluable for ensuring the continued optimal performance and longevity of the engine.