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OS Engines 120AX Ringed 1.20 Airplane Glow Engine with Muffler

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    Perfect for 3D, precision and sport flying!

    Admit it: if you could ratchet up horsepower without having to increase the mounting space, you’d probably jump at the chance. Well, here it is. The 120AX boasts 25% more displacement than a .91 (think of the bigger props you can swing!) — and bolts into the same space, with almost no extra weight. And that’s not all. The 120AX’s innovative Power Box muffler offers mounting versatility that translates into value. Plus, the angled heat sink head not only looks sharp, it adds more surface area, for better cooling. Here’s a golden opportunity to boost your airplane's flying capabilities — with almost no modification!
    O.S. 120AX Ringed w/Muffler - Muffler
    With the 120AX, there’s no need to buy an expensive aftermarket muffler!
    O.S. 120AX Ringed w/Muffler - Power Box
    The included Power Box comes with two adapters — one of which turns the muffler 90° to become a “Pitts style“.
    O.S. 120AX Ringed w/Muffler - 1.20 Size
    With the 120AX and .91 side by side, you can see how they’re virtually identical in size — but you’ll enjoy a big difference in performance!
    • Ideal for 3D, Precision and Sport flying
    • Mounting Application: Mounts in same space as the .91FX (actual mounting dimensions vary slightly
    • Internal Construction: Steel piston ring and liner, aluminum piston
    • Muffler: E-5020 "Power Box" with extension and 90° adapters
    • 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

    Product Specs

    Bore
    1.197" (30 mm)
    Carb Type
    Rotary
    Crankshaft Threads
    UNF5/16-24
    Crankshaft Type
    Threaded
    Cylinders
    Single
    Displacement
    1.218 cu in (19.96 cc)
    Engine (Only) Weight
    1.305lbs (592g)
    Muffler Type
    2-piece aluminum
    Muffler Weight
    7.07 oz (219.2 g) w/90 deg adapter installed, 7.9 oz (245 g) w/extension installed
    Oil Type & Content
    At least 18% synthetic lubricant
    Plug Type
    O.S. #8
    Power Type
    Glow
    Product Height
    4.3" (109.2mm) bottom of crankcase to top of cylinder head
    Product Length
    3.9" (100.2mm) from back plate to front of drive hub
    Product Width
    2.6" (67mm) at mounting tabs
    Prop Range
    15 x 10-12 or 16x8-10
    RPM Range
    1,800 - 9,500 RPM
    Stroke
    1.083" (27.5mm)
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