The Mercury Mariner 20 JET, part of the JET Series, represents a robust and reliable outboard engine designed for various watercraft applications. This 20-horsepower model, produced in the year 20, features a water-cooled, gasoline-powered engine with a CDI ignition system. Its propulsion is managed by a jet drive system, offering efficient performance. Depending on the specific configuration, it can be equipped with manual or electric start and manual or power trim, providing versatility for different operational needs. This Factory Service Repair Manual in English provides comprehensive guidance for maintaining and repairing the Mercury Mariner 20 JET. It covers essential areas including engine specifications, lubrication, recommended practices for fuel and spark plugs, and details on the outboard lower unit. The manual is designed to assist owners, mechanics, and technicians in understanding the intricacies of the engine, ensuring its longevity and optimal performance through detailed procedures and technical information.