This manual covers Johnson Evinrude Outboard Motors manufactured between 1973 and 1990. These 2-stroke engines, ranging from 2 to 40 HP and featuring 1-2 cylinders, were designed for reliability and performance on the water. Popular models include those with 2, 3.5, 9.9, 15, 25, 30, and 40 HP ratings. This comprehensive guide is intended to assist owners and technicians in understanding and maintaining these robust marine propulsion systems. The purpose of this Service Repair Manual is to provide detailed instructions for the repair, service, restoration, maintenance, rebuilding, and diagnosis of your Johnson Evinrude outboard motor. It covers a wide array of essential topics, including general information, tools, troubleshooting, lubrication, tune-ups, fuel and electrical systems, power head and gearcase maintenance, and wiring diagrams. This manual is an indispensable resource for both DIY enthusiasts and professional technicians seeking to ensure their engines operate at peak efficiency and longevity.