This manual covers the Mercury Mariner 2-Stroke Outboard models, specifically those with 40hp, 50hp, 55hp, and 60hp power options. Engineered for reliability and performance, these outboards are designed to provide dependable power for a variety of marine applications. Their robust 2-stroke design, coupled with features like oil injection and a typical forward, neutral, and reverse gear system, ensures efficient operation and ease of use on the water. This comprehensive service manual provides detailed information essential for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard. It includes in-depth coverage of routine maintenance procedures, engine rebuilding instructions for both the power head and gearcase, and detailed explanations of the fuel, ignition, and electrical systems, complete with wiring diagrams. Furthermore, the manual addresses the tilt and trim system, engine synchronization, and linkage, offering a complete resource for owners, technicians, and mechanics to ensure optimal performance and longevity of their engine.