This manual covers the Mercury Mariner 75, 90, 100, 115, and 125 HP outboard engines. These water-cooled, 2-stroke outboards are designed for a range of marine applications, offering reliable performance and robust engineering. The engines feature a fuel system including a fuel pump, carburetor, and oil injection, alongside an electrical system encompassing ignition, charging, and starting components. Their durable construction and efficient design make them suitable for various boating needs, ensuring consistent power and operation on the water. This comprehensive Factory Service Repair Manual, written in English, provides detailed information for maintaining and repairing your Mercury Mariner outboard. It includes step-by-step repair procedures, advanced troubleshooting guides, and diagnostic procedures, all supported by numerous illustrations, diagrams, photos, and drawings. With a numbered table of contents and search functionality, navigating hundreds of pages of essential information is straightforward. This manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their Mercury Mariner outboard engine.