O.S.Engine 3AY00 - FS-64V 10.46cc 4-Stroke Engine w/ SilencerO. S. FS 64V 4 stroke Engine for scale sport airplanes By increasing the stroke, not only propellers of 12x7 8 and 13x6 sizes, but also propellers with large loads (13x7 8, 14x6) can be used without any loss of power. A newly designed cylinder head is adopted along with the increased displacement. The internal capacity of the combustion chamber has been expanded to achieve more realistic 4 stroke exhaust sound and more power. The F 4051 silencer,