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OS GF 40 Four Stroke Petrol

It's a four stroke. It's a petrol with all the cleanliness and economy that comes with it and it's an OS. Not a lot to dislike here!
The O.S. GF 40 combines the ease of use and economy of the traditional 4-stroke engine with a gasoline engine. The fast and powerful response is ideal for scale sport and aerobatic models. The attachment points are identical to the GT 33 2 stroke engine. The carburetor was from O.S. developed in collaboration with WalbroŽ specifically for this engine.


Supplied with ignition unit and silencer.


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


Distance of screw hole / longitudinal [mm]: 54
Distance of screw hole / crosswise [mm]: 70
Item Number Manufacturer: 39400
Diameter of fixing hole [mm]: 5,2
Bore [mm]: 40
Width [mm]: 83.7
rpm range, approx.: 1800 - 9000
Recommended propeller: 18x8 - 20x10
All-up weight [g]: 1378
Height approx. [mm]: 157.2
Stroke [mm]: 31.8
Cylinder capacity [ccm]: 39.96
Cooling system: Air
Length to hub: 118.5
Output [kW / PS] at [rpm]: 3.75
Carburetor : WT GF 40
Shaft diameter [mm]: 7,8
Shaft thread: UNF-5/16-24



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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