This manual covers the Yamaha 70ETLD, a 1990 model 2-stroke outboard engine. This engine features a 3-cylinder configuration with a displacement of 1140 cc, a bore of 82 mm, and a stroke of 71 mm, delivering 70 HP. It utilizes carburetor fuel induction, a water-cooled system, and CDI ignition. The transmission is an outboard lower unit with a typical 2.15:1 gear ratio, featuring splined drive and propeller shafts. Engineered for reliability and performance, this Yamaha outboard is designed for demanding marine applications. The purpose of this Service Repair Maintenance Manual is to provide comprehensive guidance for the Yamaha 70ETLD outboard. It details essential maintenance procedures, troubleshooting steps, and technical specifications necessary for optimal operation and longevity. Key areas covered include recommended oil types, fluid capacities, spark plug specifications, and service intervals for engine and gearcase oil. This manual is an indispensable resource for owners, mechanics, and technicians, offering step-by-step instructions and diagrams to ensure proper upkeep and repair of the engine.