This workshop service repair manual covers the Mercury Mariner Marathon Seapro models manufactured between 1998 and 2002. These 2-stroke, water-cooled outboard engines, specifically the 25hp Marathon Seapro variant, are designed for reliable performance. The Mariner Marathon Seapro line is engineered for durability and efficiency, offering a robust solution for various marine applications. This comprehensive manual provides detailed instructions for all service and repair procedures, covering every aspect from A to Z. It is designed to assist owners and technicians in maintaining and repairing their Mercury Mariner Marathon Seapro engines. With easy-to-follow, step-by-step instructions and accompanying pictures, this manual empowers users to perform their own maintenance and repairs, saving time and money.