This manual covers Mercury Mariner Outboard engines manufactured between 2001 and 2005, encompassing a wide range of models from 2.5hp to 225hp. These outboards are known for their robust engineering and reliability, designed to meet the demands of various marine applications. The manual details different engine types, including 2-stroke and 4-stroke configurations, and provides specific information relevant to their power output and displacement. The purpose of this comprehensive service and repair manual is to provide detailed guidance for the maintenance, diagnosis, and repair of your Mercury Mariner Outboard. It includes essential information on tune-up procedures, preventive maintenance to ensure longevity, and in-depth coverage of key systems such as the fuel, ignition, electrical, lubrication, cooling, powerhead, lower unit, trim and tilt, remote control, and starter systems. This manual is an indispensable resource for owners, amateur mechanics, and professional technicians alike.