This manual covers the Mercury Mariner Outboard 80 HP, an outboard motor designed for marine propulsion. Engineered for reliable performance, this water-cooled engine features a power output of 80 horsepower and utilizes a CDI or similar ignition system. Its fuel system can be carbureted or fuel injected, depending on the specific model. The outboard motor is paired with a gearcase providing forward, neutral, and reverse gears, and requires specific marine gear lube for lubrication. This comprehensive service repair manual provides essential information for maintaining and repairing your Mercury Mariner Outboard 80 HP. It details critical maintenance procedures, including recommended intervals and fluid types for engine oil and gear lube. The manual also covers troubleshooting, technical specifications, and safety guidelines necessary for proper operation and longevity. Owners, mechanics, and technicians will find this English-language guide invaluable for ensuring optimal performance and addressing any service needs.