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OS FS 120 Surpass III with pump including silencer

OS has developed a new generation of four-stroke single-cylinder motors with the FS-SURPASS series. Their power in particular significantly exceeds the predecessor OS four-stroke motors of the same capacity.

The supplied silencer delivers quiet smooth power with the distinctive four stroke sound.

    Features a reversible carb and black rocker cover, and the new regulating style pump delivers superb response and reliability. A refined engine for the larger aerobatic or scale model.


A superb engine that will give years of trouble free life. It is after all an O.S.!


Distance of screw hole / longitudinal [mm]: 25
Distance of screw hole / crosswise [mm]: 58
Diameter of fixing hole [mm]: 5
Bore [mm]: 30,4
Width [mm]: 67
rpm range, approx.: 2000-12000
Recommended propeller: 15x8 - 16x10
All-up weight [g]: 920
Height approx. [mm]: 138
Stroke [mm]: 27,5
Cylinder capacity [ccm]: 19,96
Length to hub: 135
Output [W]: 1,539 (2,1)
Output [kW / PS] at [rpm]: 12000
Carburetor : 60C
Shaft thread: 5/16"-24 UNF


pdf To download a PDF of the parts listing please click here

Spares and Accessories for your O.S. Engine
If you need any spares or accessories for your engine that are not listed on the site please contact us for a price and availability.

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