This manual covers the Mercury Mariner 20 HP JET outboard motor, a versatile and reliable power unit designed for a variety of watercraft applications. Engineered with a water-cooled, carbureted system and a CDI ignition, this motor delivers efficient performance for its class. Its outboard jet drive transmission provides excellent maneuverability, making it suitable for shallow water operation. The motor utilizes unleaded gasoline and requires 2-stroke outboard oil, with specific service intervals detailed within this guide. Whether for recreational boating or commercial use, the Mercury Mariner 20 HP JET is built for dependable operation. This comprehensive Service Repair Workshop Manual in English provides essential information for the maintenance and repair of your Mercury Mariner 20 HP JET outboard motor. It includes detailed procedures for routine maintenance, troubleshooting common issues, and understanding technical specifications. This manual is an indispensable resource for owners, mechanics, and technicians, offering clear instructions and guidance to ensure the optimal performance, longevity, and safety of the motor. By following the outlined procedures, users can effectively manage all aspects of the motor's upkeep.