This Service and Repair Manual covers the Mercury Mariner outboard motor models produced between 1986 and 2003. These engines are known for their reliable 2-stroke operation, with a 10 HP displacement, water-cooled system, and a carbureted fuel system. The transmission features a standard outboard gearcase with Forward, Neutral, and Reverse gears, making these motors suitable for a variety of small watercraft applications. This manual provides comprehensive guidance for maintaining and repairing your Mercury Mariner outboard. It details general maintenance, periodic lubrication, engine service and repair, and troubleshooting procedures. Specific coverage includes the cooling system, fuel system, brake system, steering system, emission system, and engine control system. Wiring diagrams are also included to assist with electrical system diagnostics and repair, ensuring all aspects of the motor can be addressed.