This service repair manual covers Yamaha outboard motors with horsepower ranging from 150 HP to 225 HP, including specific engine models such as 150A, 150F, L150F, D150H, 175D, 200F, L200F, 200G, and 225D, as well as numerous engine variants. These robust outboard motors are engineered for reliability and performance, making them suitable for a wide array of marine applications. The manual is presented in English and is designed for easy-to-read text, top-quality diagrams, and step-by-step instructions, ensuring clarity for both do-it-yourself enthusiasts and experienced mechanics. The purpose of this manual is to provide comprehensive guidance for the service and repair of your Yamaha outboard motor. It details general information, specifications, periodic inspections and adjustments, fuel system, power unit, lower unit, bracket unit, electrical systems, trouble analysis, and includes wiring diagrams. This resource is invaluable for maintaining your engine's optimal performance and longevity, empowering owners and technicians with the knowledge needed for effective upkeep and troubleshooting.