This manual covers the 1966 Johnson Skee-Horse snowmobile, a product of Outboard Marine Corporation (OMC). As an early entry into the recreational snowmobile market, the Skee-Horse represented Johnson's application of its engine expertise to a new terrain. This model, characterized by its simple and robust design for the era, featured a single-cylinder, air-cooled 2-stroke engine and a chain drive system. It was engineered for recreational use, competing with other emerging snowmobile brands of the mid-1960s and offering a foundational piece of early snowmobile innovation. The purpose of this owner's manual is to provide essential information for the operation, maintenance, and basic troubleshooting of your 1966 Johnson Skee-Horse snowmobile. It details critical areas including engine care, fuel and oil requirements, drive system adjustments, lubrication, and storage procedures. Safety precautions and basic technical specifications are also included to assist owners and technicians in maintaining the vehicle's performance and ensuring safe operation. This guide covers the engine, fuel system, ignition, drive system, chassis, and controls, offering guidance for owner-level upkeep.