This manual covers McCulloch Outboard Sears outboard motors manufactured between 1960 and 1968, spanning a power range from 3.5hp to 75hp. These early to mid-1960s models are characterized by their robust 2-stroke, air-cooled engine design, available with one or two cylinders depending on horsepower. They feature a simple yet effective Forward, Neutral, Reverse (F-N-R) transmission with an integrated gearbox and typically utilize a tiller handle for throttle control and steering. The engines operate on a gasoline and 2-stroke oil mixture and employ either magneto or battery ignition systems. These outboards were engineered for reliability and performance, making them a popular choice for a variety of boating applications during their production era. The purpose of this Service and Repair Manual is to provide comprehensive guidance for the maintenance and repair of your McCulloch Outboard Sears motor. It details essential procedures, including lubrication, fuel system servicing, cooling system maintenance, and ignition system checks. Specific maintenance intervals for critical components like the water pump impeller and spark plugs are outlined to ensure optimal performance and longevity. Technical specifications, troubleshooting advice, and safety guidelines are also included to assist owners, mechanics, and technicians in keeping these classic outboard engines in excellent working condition.