OS Engine GF40 4-Stroke Gas Engine W/Muffler

4-stroke power with gasoline economy.

• 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.

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
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
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

The compact IG-04 ignition module provides fast, easy starts with most types of batteries, including LiPos and LiFes.

The GF40 includes a F-6040 muffler. A repositionable exhaust lets you divert exhaust residue out and away from your plane’s finish.

The carburetor, developed jointly by O.S. and Walbro, is rear-mounted for easy installation and adjustment.