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120AX Ring 70D Carb No Muffler

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120AX Ring 70D Carb No Muffler

O.S. Engines OSMG0651 Airplane Engine Nitro
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  • 120AX Ring 70D Carb No Muffler

    This is the 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 (OSMG2693) will also work
    Warranty: Two-year limited


    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 18% 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
    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)

    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


    For version with muffler, order OSMG0650.

  • O.S. Engines 120AX Ring 70D Carb No Muffler Parts List (0 items)

  • O.S. Engines 120AX Ring 70D Carb No Muffler Hop-Ups & Optional Accessories (2 items)

    • O.S. Engines OSMG2691 Glow Plug
      In Stock

      The O.S. #8 glow plug is the most widely used O.S. glow plug. Recommended for most current O.S. (and other brands of) 2-stroke … Read More

    • O.S. Engines OSMG2693 Glow Plug
      In Stock

      This is the #10 (A5) Glow Plug from O.S. Engines. Features Medium-cold heat range plug that is ideal for aircraft glow engines . … Read More

      This product may take one additional day to ship (and may delay rest of order).
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