This manual covers the Mercury Mariner 50 HP Bigfoot, a 4-stroke outboard motor designed for reliable performance. While specific model years are not detailed, this comprehensive guide is intended for a range of production years, ensuring its applicability for owners of this robust engine. The Mariner series is known for its engineering quality and dependable operation, making it a trusted choice for various marine applications. This Factory Service Repair Manual, written in English, provides essential information for maintaining and repairing your Mercury Mariner outboard. It includes detailed step-by-step repair procedures, advanced troubleshooting guides, and methods for diagnosing engine fault symptoms. With hundreds of pages of content, including necessary illustrations, diagrams, photos, and detailed wiring diagrams, this manual is an indispensable resource for owners and technicians alike, offering common tips and techniques to ensure optimal performance and longevity of the engine.