This Service Repair Workshop Manual covers the Mercury Mariner 65/80 HP Jet outboard motor. This gasoline-powered, water-cooled engine utilizes an impeller for propulsion, offering the advantage of shallow water operation. Designed for reliable performance, this engine is engineered to deliver consistent power output of either 65 HP or 80 HP, making it suitable for a variety of marine applications. This comprehensive manual provides essential information for the maintenance and repair of your Mercury Mariner 65/80 HP Jet outboard. It details crucial procedures, including scheduled maintenance tasks such as oil changes and spark plug replacement, as well as fluid capacity information. The manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their marine propulsion system.