This manual covers the Yamaha 150ETLH, a 150 horsepower, 2-stroke, inline 4-cylinder outboard motor from the First Generation 150HP Series, produced in 1987. Designed for reliable performance on the water, this engine features a carbureted fuel system and CDI ignition, delivering robust power for a variety of marine applications. Its robust engineering and durable construction are hallmarks of Yamaha's commitment to quality and longevity, making it a dependable choice for boaters. This comprehensive Service Repair Maintenance Factory Professional Manual in English provides detailed instructions for all disassembly, repair, assembly, and inspection operations. It includes step-by-step procedures and exploded diagrams, presented in a bookmarked and searchable digital format. This resource is essential for owners, mechanics, and technicians to ensure the proper maintenance, troubleshooting, and repair of the Yamaha 150ETLH, maximizing its performance and lifespan.