This service and repair manual covers Yamaha outboard motors, specifically models E115A, 115B, and 140B. These robust motors are engineered for reliability and performance in various marine applications. The detailed information within this manual is designed to assist users in understanding the intricacies of these Yamaha outboard motors, ensuring optimal operation and longevity through proper care and maintenance. This comprehensive manual provides essential guidance for servicing, repairing, and maintaining your Yamaha outboard motor. It includes detailed procedures for periodic checks, adjustments, and technical maintenance, alongside in-depth troubleshooting and repair instructions for various systems, including the fuel, power, bracket, electrical, and lower units. With extensive illustrations, exploded diagrams, and wiring schematics, this manual is an indispensable resource for owners and technicians alike.