This Service Repair Manual covers Yamaha 150HP Outboard models manufactured between 1996 and 2008. These robust engines, available in 2-stroke and 4-stroke configurations with 6 or 4 cylinders, offer reliable performance for a variety of marine applications. Featuring advanced fuel delivery systems including carburetors and EFI, and a powerful 150 horsepower output, these outboards are engineered for durability and efficiency. The manual encompasses models equipped with Jetdrive, providing comprehensive support for this versatile propulsion system. The purpose of this manual is to provide detailed information for the maintenance, repair, and troubleshooting of your Yamaha 150HP Outboard. It includes essential sections on general information, technical specifications, periodic inspections and adjustments, fuel system, engine, lower unit, bracket unit, and electrical system. Specific troubleshooting guidance is offered for common issues such as starting difficulties, poor engine performance, overheating, battery charging problems, and oil injection system malfunctions. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their Yamaha outboard.