This manual covers Mercury Mariner outboard jet drive models, specifically those in the 65-80 HP range. These engines are engineered for reliable performance and feature a water-cooled system, a CDI ignition, and a carbureted fuel system. They are designed for a 12-volt electrical system and utilize an alternator for charging. The propulsion system is a jet drive, offering efficient operation. Maintenance items covered include engine tune-ups, carburetor and gearcase service, and electrical and fuel system upkeep. The purpose of this Factory Service Repair Manual is to provide comprehensive guidance for the maintenance, repair, and servicing of your Mercury Mariner outboard. It details essential procedures, technical specifications, and troubleshooting steps necessary to keep your engine operating at peak performance. This manual is an indispensable resource for owners, mechanics, and technicians, offering clear instructions and diagrams to ensure proper upkeep and efficient problem resolution for models equipped with CDI ignition and electric or manual start systems.