GF40 Gasoline Engine from O.S. Engines

Apr 01, 2013 No Comments by

Ideal for aerobatic or scale aircraft, the 4-stroke GF40 offers excellent torque and a realistic sound, plus fuel economy and the fit and finish O.S. is famous for. Other features include a Walbro carburetor and an integrated choke rod guide that simplifies installation. The GF40 includes a muffler, spark plug, ignition module and a 2-year limited warranty.


  • Firewall mounting system (same as the GT33)
  • Positive Crankcase Ventilation (PCV) system helps keep the model and the environment cleaner without blow-by gas and oil waste
  • Choke rod guide is integrated with the backplate for convenience
  • Includes a special Walbro carb and a compact, lightweight ignition module


Engine:                            GF40

Manufacturer:               O.S. Engines

Distributor:                     Hobbico

Type:                                4-stroke Gasoline

Displacement:                2.438 cu in

Bore:                                  1.57 in

Stroke:                              1.251 in

RPM Range:                    1,800-9,000

Engine Weight:                42.3 oz

Muffler Weight:               4.0 oz

Ign. Module Weight:      3.4 oz (95 g)

Recommended Props:   18 x 6W, 18 x 10, 18 x 12, 20 x 8W

Price:                                  $799.99

For more information go to

Featured News, Hobbico, O.S.

About the author

Senior Technical Editor About Me: I have a lifelong passion for all things scale, and I love to design, build and fly scale RC airplanes. With 20 plus years as part of the Air Age family of magazines, I love producing Model Airplane News and Electric Flight.
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