This manual covers the Mercury Mariner outboard motor, featuring powerful V6 engines with Electronic Fuel Injection (EFI) and available in 225 HP and 250 HP variants. These motors are engineered for reliable performance and efficiency, utilizing a 3.0L displacement and a Capacitor Discharge Ignition (CDI) system. With features such as Power Trim and Tilt, and a robust 12-pole stator charging system providing 10 Amps at 1000 RPM, the Mercury Mariner is designed to meet the demands of various marine applications. The Service Repair Manual provides comprehensive guidance for maintaining and repairing your Mercury Mariner outboard motor. It details essential maintenance procedures, including recommended lubrication, spark plug specifications, and fuel system care, along with information on the cooling and gear lube systems. Technical specifications and troubleshooting advice are included to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the engine.