This manual covers the Yamaha C55ELRP outboard motor, manufactured in 1991. Designed for marine propulsion, this 2-stroke, gasoline-powered motor delivers 55 horsepower. Yamaha is recognized for its engineering quality and reliable performance, making this outboard motor a dependable choice for various watercraft applications. This Factory Service Repair Maintenance Manual, written in English, provides comprehensive guidance for maintaining and repairing your Yamaha C55ELRP. It includes detailed information on general procedures, periodic inspections and adjustments, fuel system, power unit, lower unit, bracket unit, and electrical system. With step-by-step instructions, detailed wiring diagrams, circuit diagrams, illustrations, photos, and exploded views, this manual is an essential resource for owners and technicians to ensure optimal performance and longevity of the outboard motor. Troubleshooting sections and diagnostic information are also included to assist with issue resolution.