O.S. Engines FX Series

Engineered for superior, longer-lasting power.

All FX engines feature dual ball bearings for durability and smooth operation, plus a low crankcase profile that allows for a proportionately taller, semi-squared head — a design refinement that increases cooling fin area and improves heat dispersion. Plus, you'll never have to worry about losing a prop during flight — the threaded portion of FX crankshafts is extra-long, to promote better engagement of the prop, nut and spinner and greater flight safety.
O.S. Two Year Warranty

The needle valve of every FX engine is remotely mounted for protection. An O-ring and ratchet spring minimize “creep” due to air leaks and vibration. The LC needle valve on the 61FX can be positioned horizontally or vertically, to help eliminate the need for cowl modifications.
FX engines have the same mounting dimensions as their SF Series counterparts, so replacement is “drop-in” easy. All (except 160FX w/o Muffler) include a muffler and all also include a glow plug. 2-year limited warranty.

61FX w/Muffler

The Remote Needle Valve - one of the most dramatic innovations of the FX Series - lets you make adjustments to the fuel and air mixture with your fingers safely away from the spinning propeller.