This service manual covers the Mercury Mariner outboard, a 4-stroke engine with a 323 cc displacement and 9.9 horsepower. Designed for marine propulsion, this engine features a carbureted fuel system, CDI ignition, and water cooling. Its robust construction and reliable performance make it a dependable choice for various boating applications. The Mariner outboard is engineered for efficient operation and ease of use, featuring a tiller handle for steering and a Forward-Neutral-Reverse gear selection. This comprehensive service manual provides essential information for the maintenance and repair of the Mercury Mariner outboard. It details critical procedures, technical specifications, and troubleshooting guidance necessary for optimal performance and longevity. Owners, technicians, and mechanics will find this manual invaluable for understanding the engine's systems, performing routine service, and addressing any potential issues. The manual is presented in English to ensure accessibility for a wide range of users.