This service repair manual covers Mercury Mariner outboard motors, specifically 2-stroke models designed for marine propulsion. These engines range from 75 to 250 horsepower and utilize either carburetor or Electronic Fuel Injection (EFI) induction, including Optimax configurations. The models covered span production years from 1998 through 2009, encompassing a wide variety of inline and V-configuration engines. This manual is an essential resource for understanding the engineering and performance capabilities of these robust marine propulsion systems. The purpose of this manual is to provide comprehensive guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard motor. It details general information, routine maintenance procedures, engine removal and installation, fuel and lubrication systems, cooling systems, electrical systems, and transmission components. Technical specifications and advanced troubleshooting techniques are also included. By following the instructions within this English-language manual, owners, mechanics, and technicians can ensure optimal performance, reliability, and longevity of their marine engines.