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3.1 out of 5 Customer Rating

GF40 40cc 4-Stroke Gas Airplane Engine with Muffler

Item No. OSMG0800
Brand Logo
3.1 out of 5 Customer Rating

GF40 40cc 4-Stroke Gas Airplane Engine with Muffler

Item No. OSMG0800
$989.99
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Product Details

A compact, 4-stroke gasoline powerhouse.

Ideal for aerobatic or scale aircraft, the 4-stroke GF40 offers added torque and a more realistic sound, plus gas economy and the fit and finish O.S. is famous for. It also includes an ignition module that eases starting and automatically adjusts timing to throttle settings. Other features include a Walbro® carburetor and an integrated choke rod guide that simplifies installation. The GF40 includes a muffler, spark plug and a 2-year limited warranty.


O.S. Two Year Limited Warranty
  • Easily installs in the same mounting pattern as the GT33
  • Positive Crankcase Ventilation (PCV) system helps keep your 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

Product Specifications

Manufacturer # 39400
Product Height 6.2 in (157.2mm) bottom of mount to top of cylinder cover
RPM Range 1,800 - 9,000 rpm
Cylinders Single
Bore 1.57 in (40mm)
Stroke 1.25 in (31.8mm)
Product Width 3.3 in (83.7mm)
Power Type Gas
Plug Type CM6 Spark Plug
Benchmark Prop 18x8-12 - 20x8-10
Displacement 2.44 cu in (39.96 cc)
Product Length 4.7 in (118.5mm) from backplate to drive hub
Crankshaft Threads UNF5/16-24
Engine (Only) Weight 2.64 lb (1.2 kg)