O.S. Max Two-Stroke 1.20AX ringed engine without a muffler.

  • Ideal for 3D, precision and sport flying.
  • Mounts in same space as the .91FX (actual mounting dimensions vary slightly, see SPECS)
  • Steel piston ring and liner, aluminium piston
  • Carburetor: 70D with rearward angled needle valve for safety.
  • Glowplug: O.S. #8 supplied with engine, A5 can also be used.
1.218 cu in (19.96cc)
1.197" (30.4mm)
1.083" (27.5mm)
Crankshaft thread size
Practical RPM
1,800 - 9,500 RPM
Power Output
3.1ps/9000 RPM
22.82oz (647g) without muffler
7.074oz (219.2g) with 90? adapter installed
7.907oz (245g) with extension installed
Distance Between Mounting Holes Same Side
0.98" (25mm)
Distance Between Mounting Holes Opposite Side
2.3" (58mm)
Distance Center of Crankcase to End of Crankshaft
4.3" (109.5mm)
Distance Center of Crankcase to Drive Hub
2.7" (69.8mm)
Width Between Mounting Tabs
2.6" (67mm)
Width of Crankcase Below Mounting Tabs
1.8" (46.5)
Length from Backplate to End of Crankshaft
5.5" (139.9mm)
Length from Backplate to Drive Hub
3.9" (100.2mm)
Height/Bottom of Crankcase to Top of Cylinder Head
4.3" (109.2mm)
Height/Bottom of Mounting Tabs/Top of Cylinder Head
3.4" (85.7mm)
SKU OSM19218
Brand OS

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