This manual covers Johnson Evinrude Outboards 70 HP models manufactured between 1973 and 1990. These engines are recognized for their robust engineering and reliable performance, making them a trusted choice for a wide range of marine applications. This comprehensive guide is designed to provide detailed information to ensure optimal operation and longevity of your Johnson Evinrude outboard. The purpose of this Factory Service Repair Manual is to offer complete technical guidance for maintenance, diagnostics, and repair. It includes detailed procedures for tune-ups, lubrication, and maintenance schedules, alongside comprehensive troubleshooting information, wiring diagrams, and electrical system service. With step-by-step instructions, illustrations, and coverage for engine and drivetrain repairs, this manual is an essential resource for owners and technicians alike to maintain and service their Johnson Evinrude outboard.