This manual covers the 1988 Yamaha 150ETLG Outboard, a powerful 2-stroke, 4-cylinder engine designed for marine applications. With a displacement of 1470 cc, a bore of 82 mm, and a stroke of 73 mm, this water-cooled outboard delivers 150 horsepower at 5000-5500 RPM. It features a carbureted fuel system, a CDI ignition, and a gear ratio of 1.86:1, making it a robust choice for various boating needs. The 20-inch shaft length and a weight of 172 kg further define its operational capabilities. This comprehensive Service Repair Maintenance Manual provides essential information for the upkeep and repair of your 1988 Yamaha 150ETLG Outboard. It details critical maintenance procedures, including recommended oil types and capacities, spark plug specifications, and electrical system details such as alternator output. Technical specifications, troubleshooting guidance, and safety information are also included, empowering owners, mechanics, and technicians to ensure optimal performance and longevity of the engine.