Radio-controlled O.S. GF-40 Gasoline 4-Stroke Engine

This is a four-stroke engine whose exhaust sound perfectly matches scale models.

The quick responsiveness and characteristic torque of a four-stroke engine also suit aerobatic and sport models.

The mounting hole spacing is the same as that of the O.S. GT33, allowing for easy installation on existing models.

(The distance between the mounts and the drive hub face is the same as that of the GT33.)

The same fuel as for a two-stroke engine can be used. (Oil/fuel mix ratio: 25:1 to 50:1.)

A new specific carburetor has been developed in collaboration with Walbro.

A new specific, compact, and lightweight ignition module has been designed.

A convenient starter rod guide is integrated into the backplate.

A Positive Crankcase Ventilation (PCV) system is used, preventing model and environmental contamination by preventing the emission of blow-by gases and oil residues.

Features:

- Displacement: 39.96 cc
- Bore: 40.0 mm
- Stroke: 31.8 mm
- Power: 3.8 hp
- Shaft Thread: UNF-5/16-24
- Carburetor: WT GF 40
- Engine Weight: 1432g
- Rotation: 1800/9000 rpm
- Power (kW, PS) at: 3.75 U/min
- Recommended Propellers: 18x8-12, 19x8-10 & 20x8-10
- Recommended Propeller for Break-in: 18x8
- Ignition Battery: 4-7 NiCd / NiMH; 2S LiPo / LiFe. Min. Capacity: 1000mAh