One of the most powerful engines from OS, the GF40 is a 4-stroke gasoline engine. Its quick response makes it an excellent choice for aerobatic models. If you are a scale model pilot, you will also benefit from the deeper exhaust sound of the GF40; similar to that of full-size aircraft. This OS engine has the same mounting bolt pattern and mount-to-drive hub of the GT33. Its fuel economy is excellent; running on a mixture of engine oil and standard gasoline. The GF40 also features a Postive Crankcase Ventilation (PCV) system, which recirculates blow-by gas and oil waste. This is not only environmentally-friendly, but makes the engine cleaner. Additionally, the GF40 comes with an F-6040 silencer and integral backplate. If you are a scale or aerobatic pilot, the GF40 from OS Engines is a great investment that will deliver excellent benefits to your model. Order yours today.

Features

• Offers traditional 4-stroke benefits with the ease and economy of a gasoline engine
• Quick, powerful response makes it an ideal choice for aerobatic as well as scale models
• Perfect for scale aircraft, with a deeper exhaust note 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 gasoline
• 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
• Backplate features an integral choke rod guide
• PCV (Positive Crankcase Ventilation) system recirculates blow-by gas and oil waste for a cleaner engine and environment

What you need

• 2-cycle oil
• Unleaded gasoline
• Ignition battery
• Standoffs

Specifications
Displacement: 2.438 cu in (39.96 cc)
Bore: 1.574 in (40 mm)
Stroke: 1.251 in (31.8 mm)
RPM Range: 1800-9000
Output: 3.75 hp @ 8600 rpm
Engine Weight: 41.3 oz (1170 g)
Muffler Weight: 4.0 oz (113 g)
Ignition Module: 3.4 oz (95 g)
Includes: F-6040 muffler assembly, ignition module & CM-6 spark plug
Requires: 2-cycle oil, unleaded gasoline, ignition battery & standoffs
Suggested Props: 18x8-12, 19x8-10 & 20x8-10
Suggested Break-In Prop: 18x8
Ignition Battery: 4-7 NiCd or NiMH; 2S LiPo or LiFe. Min. capacity: 1000mAh