O.S. Engines 1.20 AX w-Muffler OSM19210

O.S. Engines 1.20 AX w-Muffler OSM19210
Back Order Now
You may back order this item and it will ship when it arrives.
FREE Shipping Eligible! Learn More
Price: $339.99

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

Save In List
This item earns up to 340 VIP Reward Points Learn More

O.S. Max two stroke 1.20AX ringed engine with muffler. modelpplication: Ideal for 3D, precision and sport flying. Mounting Application: Mounts in same space as the .91FX (actual mounting dimensions vary slightly, see SPECS). Internal Construction: Steel piston ring and liner, aluminum piston. Muffler: E-5020 Power Box with extension and 90º adapters. 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 E-5020 power box muffler,#8 glow plug, muffler adapter, prop washer and lock nut, needle valve extension cable, instruction manual and decal sheet, two muffler screws, two muffler extension bolts, two long muffler bolts.


Displacement: 1.218 cu in (19.96cc)
Bore: 1.197" (30.4mm)
Stroke: 1.083" (27.5mm)
Practical RPM: 1,800 - 9,500 RPM
Power Output: 3.1 PS, 3.06HP/9000 RPM
Weight of engine: 29.0oz (823g) with muffler
Weight of muffler: 7.074oz (219.2g) with 90? adapter installed
Weight of muffler: 7.907oz (245g) with extension installed
Crankshaft thread size: 5/16-24
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)
Distance center to center of muffler mounting holes: 48mm (1.89")

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


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

This product was added to our catalog on February 11, 2009