O.S. Engines 1.20 AX w-o Muffler OSM19218

O.S. Engines 1.20 AX w-o Muffler OSM19218
Back Order Now
You may back order this item and it will ship when it arrives.
FREE Shipping Eligible! Learn More
Price: $319.99

Please Log in to receive a notification when this item arrives in stock.

Save In List
This item earns up to 320 VIP Reward Points Learn More

O.S. Max Two Stroke 1.20AX ringed engine without muffler. Model Application: Ideal for 3D, precision and sport flying. Mounting Application: Mounts in same space as the .91FX (actual mounting dimensions vary slightly, see SPECS). Construction: Steel piston ring and liner, aluminum piston. Carburetor: 70D with rearward angled needle valve for safety. Glowplug: O.S. #8 supplied with engine, A5 can also be used. Warranty: Two-year limited. This product includes O.S. Max Two Stroke 1.20AX Ringed Engine with #8 glow plug, prop washer and nut, needle valve extension set, instruction manual and decal set.


  • Fuel: Two stroke with 20% lubricant and 5-20% nitromethane
  • Muffler: E-5020 Power Box
  • Propeller: 15x10-12 or 16x8-10
  • Field Equipment: Glow starter, fuel filter, fuel pump, fuel tubing


Displacement: 1.218 cu in (19.96cc)
Bore: 1.197" (30.4mm)
Stroke: 1.083" (27.5mm)
Crankshaft thread size: 5/16-24
Practical RPM: 1,800 - 9,500 RPM
Power Output: 3.1ps/9000 RPM
Weight: 22.82oz  (647g) without muffler
Weight: 7.074oz (219.2g) with 90? adapter installed
Weight: 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)

Needle Settings

  • High Speed: 2 - 2.5 turns out from fully closed
  • Low Speed: 3/4 turn out from fully closed with the throttle fully closed

This product was added to our catalog on October 3, 2020