This manual covers the Yamaha 150ETXD outboard motor, manufactured in 1990. Designed for marine propulsion, this gasoline-powered outboard motor delivers 150 horsepower. Yamaha is recognized for its engineering quality and reliability, ensuring robust performance for various marine applications. This model represents a significant offering in outboard motor technology for its production year, built to provide dependable power on the water. The purpose of this Factory Service Repair Maintenance Manual is to provide comprehensive guidance for the maintenance and repair of your Yamaha 150ETXD. It details procedures for general information, periodic inspections and adjustments, fuel system, power unit, lower unit, bracket unit, and electrical system. The manual includes troubleshooting steps, technical specifications, and detailed diagrams such as wiring diagrams, circuit diagrams, illustrations, photos, and exploded views, all presented in English with step-by-step instructions to assist owners, mechanics, and technicians in maintaining optimal performance and longevity of the outboard motor.