The O.S.Engine 25FX-II is a high performance side exhaust aero 2-stroke engine that is suitable for many styles of small R/C aircraft such as sport, scale, aerobatic and even .25 class pylon racers. The 25FX II uses a direct needle 21L carburetor for excellent usability and a 892 silencer with adjustable exhaust direction. O.S.'s legendary standard of build quality is evident throughout.
SPECIFICATIONS:
- Displacement (cu in): 0.249 / 4cc
- Bore (in): 0.710 / 18mm
- Stroke (in): 0.630 / 16mm
- RPM: 2,500-19,000
- Output (HP@rpm): 0.84 @ 18,000
- Weight (oz): 8.8 / 249.5g
- Recommended Props : 9x5, 9x6, 9.5x5, 10x4, 10x5
