This document introduces the use of O.S. engines, including safety operation instructions, engine introduction, installation, maintenance and other contents.
This document is the owner's instruction manual for the O.S. FS-120SI, a mid-range 20cc four-cycle engine designed specifically for model aircraft. It details the features of this specific model, including its PD-07 diaphragm type fuel pump and Type 70N carburettor with a built-in pressure regulator.
All onlookers must be kept at least 20 feet or 6 meters away.
An electric starter must be used for this engine.