This manual covers Mercury Mariner 2-Stroke Outboard engines, specifically the 45 Jet, 50, 55 Marathon-Seapro, 60, and 60 Marathon-Seapro (also Bigfoot) models. These engines, featuring an in-line 3-cylinder configuration and a displacement of 60.7 cubic inches (995 cc), deliver between 45 and 60 horsepower. They are designed for reliable performance in various marine applications. The manufacturer-produced documentation emphasizes the engineering quality and robust design inherent in these Mercury Mariner outboards, ensuring dependable operation for their intended use. This comprehensive Factory Service Manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard. It includes detailed tune-up procedures, rebuilding instructions for the engine and components, and preventative maintenance guidelines to ensure longevity and optimal performance. With highly illustrated steps, clear diagrams, exploded views, and specific part numbers, this manual is an invaluable resource for DIY enthusiasts, professional technicians, and workshops. It is designed to empower users to effectively service and maintain their engines, ensuring peak operational efficiency.