This manual covers the Mercury Mariner outboard engine, a 4-stroke, water-cooled unit designed for reliable performance. This engine features a CDI ignition system and carburetor fuel delivery, producing 4 horsepower. Its outboard gearcase offers forward, neutral, and reverse gears, ensuring versatile operation. The Mercury Mariner is engineered for durability and efficiency, making it a dependable choice for various marine applications. This comprehensive Factory Service Repair Manual, written in English, provides essential information for maintaining and repairing your Mercury Mariner outboard. It details critical procedures, including lubrication with recommended Mercury Outboard Oil, scheduled maintenance intervals, and specifications for spark plugs and fuel. Safety guidelines, such as the use of the kill switch lanyard, are also covered. This manual is an indispensable resource for owners and technicians seeking to ensure the optimal performance and longevity of their Mercury Mariner engine.