This workshop service repair manual covers Yamaha 150C and V150C outboard engines. These engines are engineered for robust performance, featuring a V-engine configuration and water-cooling for efficient operation. With a power output of 150 HP, they are designed for demanding marine applications. The fuel system can be either carbureted or fuel injected, depending on the specific model variant, and likely utilizes a CDI ignition system. The transmission system includes forward, neutral, and reverse gears within an outboard gearcase. This comprehensive manual provides essential information for maintaining and repairing your Yamaha outboard. It details general information, technical specifications, and covers key systems including the fuel, power unit, lower unit, bracket unit, and electrical system. Procedures for periodic checks, adjustments, and troubleshooting are thoroughly explained. This resource is invaluable for owners and technicians alike, offering the knowledge to ensure optimal performance, reliability, and longevity of the engine through proper servicing and repair.