OS GF40 Four Stroke Petrol Engine


This the first four stroke Petrol from OS engines. It dose exactly as it says, you get the benefits of a petrol; economy, reliable tick over and cleanliness in a four stroke.

  • Quick, powerful response makes it an ideal choice for aerobatic as well as scale models.
  • Perfect for scale aircraft, with a deeper exhaust tone that mimics the sound of full-size aircraft.
  • Features the GT33’s mounting bolt pattern and mount-to-drive hub distance.
  • Outstanding fuel economy – runs on a mix of engine oil and standard petrol.
  • Rear-mounted carb designed by O.S. & Walbro®.
  • Lightweight ignition module accepts NiCd, NiMH, LiPo or LiFe battery power.
  • Muffler and integral backplate mount included.
  • PCV (Positive Crankcase Ventilation) system recirculates blow-by gas and oil waste for a cleaner engine and environment.



Displacement:2.438 cu in (39.96 cc)
Rpm Range: 1800-9000
Output: 3.75 hp @ 8600 rpm
Weight: Engine:41.3 oz (1170 g) / Muffler:4.0 oz (113 g) Ignition Module:3.4 oz (95 g)
Includes: F-6040 muffler assembly, ignition module & CM-6 spark plug
Recommended props: 13×8, 13×9, 13×10, 13×11, 14×8, 14×9, 14×10, 15×6, 15×7, 15×8

Find the dimensions and parts view here: GF40 Dimensions


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