This manual covers Yamaha 50hp 4-stroke, High Thrust, and F50 (35hp) Jetdrive outboard motors manufactured between 2001 and 2003. These robust 4-stroke engines are engineered for reliability and performance, offering versatile solutions for various marine applications. The 50hp models, including the High Thrust variants, and the F50 Jetdrive are designed to provide dependable power and efficiency for recreational and commercial use. The purpose of this comprehensive Service Repair Manual is to provide detailed guidance for the maintenance and repair of these Yamaha outboard motors. It includes step-by-step instructions, detailed wiring and circuit diagrams, illustrations, photos, and exploded views. Key areas covered include general information, periodic inspections and adjustments, fuel system, power unit, lower unit, electrical system, bracket unit, specifications, and troubleshooting. This manual is an essential resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their Yamaha outboard motors.