This comprehensive service manual provides detailed instructions and technical specifications for the Mercury Mariner Outboard 25 MARATHON 25 SEAPRO. It is a valuable resource for anyone who needs to maintain, repair, or service this engine. The manual covers a wide range of topics, including engine assembly and disassembly, troubleshooting, electrical systems, fuel systems, lubrication, cooling, and more. With clear diagrams, step-by-step procedures, and extensive parts lists, this service manual empowers users to confidently perform repairs and maintenance on their Mercury Mariner Outboard 25 MARATHON 25 SEAPRO. Whether you're a professional mechanic or a DIY enthusiast, this manual will equip you with the knowledge and tools to keep your engine in peak condition.

The Mercury Mariner 25 MARATHON 25 SEAPRO is a compact and reliable 25 horsepower outboard engine designed for small boats and recreational use. This engine is part of the Mercury Mariner line, known for its durability and ease of maintenance. The MARATHON 25 SEAPRO variant is specifically geared towards smaller, lighter boats like inflatable dinghies, tenders, and small fishing boats. It boasts a powerful 2-cylinder, 4-stroke engine that delivers smooth and quiet performance, ideal for relaxing outings and fishing expeditions. The 25 MARATHON SEAPRO utilizes a single-cylinder design, providing excellent fuel efficiency and making it a cost-effective option for extended outings. Its lightweight design and compact size make it easy to transport and install. The SEAPRO package includes a variety of features tailored for marine applications, such as a corrosion-resistant finish, a durable propeller, and an integrated tilt mechanism for convenient storage and transportation. The Mercury Mariner 25 MARATHON 25 SEAPRO is a well-regarded engine renowned for its quality and dependability. Known for its robust construction and dependable performance, it is a popular choice for recreational boaters seeking a reliable and easy-to-use power source. The engine's simplicity and efficient design make it relatively straightforward to maintain, reducing the need for frequent servicing and minimizing operating costs. The SEAPRO package offers a comprehensive set of features that contribute to its durability and performance, including a corrosion-resistant finish, a durable propeller, and an integrated tilt mechanism. These features make the Mercury Mariner 25 MARATHON 25 SEAPRO a versatile and reliable option for a wide range of small boats, offering a blend of power, efficiency, and ease of use.