This manual covers the Yamaha 9.9ELG Outboard, a 1988 model year 2-stroke outboard motor. Designed for reliable performance on the water, this compact and powerful engine features a 2-cylinder configuration, 9.9 horsepower, and a displacement of 212 cc. Its water-cooled system ensures efficient operation, while the CDI ignition provides dependable starting. The transmission offers Forward, Neutral, and Reverse gears, and the short shaft length is standard for this model. This outboard motor is engineered for durability and ease of use, making it a suitable choice for various marine applications. The purpose of this English-language service repair maintenance manual is to provide comprehensive guidance for the Yamaha 9.9ELG Outboard. It details step-by-step disassembly, repair, assembly, and inspection procedures, supported by exploded diagrams to aid understanding. The manual covers essential maintenance aspects, including recommended oil types for the engine and gearcase, and the correct fuel-to-oil mixture ratio. It also includes information on the starting system, fuel induction, propeller, and trim/tilt adjustments. This resource is designed to assist owners, mechanics, and technicians in maintaining the optimal performance and longevity of their Yamaha outboard motor.