This Service Repair Workshop Manual covers the Mercury Mariner Jet, a gasoline-powered jet outboard engine designed for marine propulsion. This engine features a CDI ignition system and a water-cooled design, delivering 80 horsepower through a jet drive transmission with Forward, Neutral, and Reverse gears. Engineered for reliability and performance on the water, the Mariner Jet represents a robust solution for various boating applications. This manual provides comprehensive guidance for the maintenance and repair of your Mercury Mariner Jet engine. It details essential procedures, including lubrication with Mercury Outboard Gear Lube, and outlines recommended intervals for critical components such as spark plugs and water pump impellers, directing users to the manual for specific details. The manual also covers safety instructions, ensuring proper operation and longevity of the engine.