This manual covers the Yamaha 90TJRP, an outboard motor produced in 1991, designed for marine propulsion in both freshwater and saltwater environments. Engineered for reliability and performance, this gasoline-powered outboard motor delivers 90 horsepower, making it a robust choice for a variety of boating applications. Its inline engine configuration and outboard drive system are hallmarks of Yamaha's commitment to quality and durability in marine technology. The purpose of this English-language Service Repair Maintenance Manual is to provide comprehensive guidance for the Yamaha 90TJRP. It details general information, periodic inspections and adjustments, and specific procedures for the fuel, power unit, lower unit, bracket unit, and electrical systems. With step-by-step instructions, detailed diagrams, illustrations, photos, exploded views, and troubleshooting guidance, this manual is an essential resource for owners, mechanics, and technicians to ensure the optimal maintenance, repair, and longevity of the outboard motor.