This document provides comprehensive information for the 2004 Yamaha Majesty YP400, a premium mid-size scooter renowned for its comfort, performance, and practicality. Designed with a focus on reliability and touring capability, the YP400 features a 395cc four-stroke, liquid-cooled engine, electronic fuel injection, and an automatic Continuously Variable Transmission (CVT) for a smooth riding experience. Its robust engineering, originating from Japan, ensures dependable operation for daily commuting and longer journeys. The scooter is equipped with dual hydraulic disc brakes at the front and a hydraulic disc brake at the rear for effective stopping power, complemented by a halogen headlight and LED taillight for optimal visibility. This workshop repair manual offers detailed guidance for owners and technicians to maintain and repair the 2004 Yamaha Majesty YP400 (chassis code 5RU). It covers all major mechanical and electrical systems, including the engine, transmission, fuel system, cooling system, braking system, and electrical components. The manual provides step-by-step instructions, exploded diagrams, torque specifications, and troubleshooting guides for all service and repair procedures. This resource is designed to facilitate routine maintenance, complex repairs, and diagnostic procedures, enabling users to perform tasks efficiently and cost-effectively, thereby preserving the vehicle's performance and longevity.