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3.4 out of 5 Customer Rating

120AX Ringed 1.20 Airplane Glow Engine with Muffler

Item No. OSMG0650
Brand Logo
3.4 out of 5 Customer Rating

120AX Ringed 1.20 Airplane Glow Engine with Muffler

Item No. OSMG0650
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Product Details

Key Features
  • 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
In The Box
  • 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.
Needed to Complete
  • Fuel: Two-Stroke with 18% lubricant and 5-20% nitromethane
  • Propeller: 15x10-12 or 16x8-10
  • Field Equipment: Glow starter, fuel filter, fuel pump, fuel tubing
120AX Ringed 1.20 Airplane Glow Engine with Muffler

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. Engines two year limited warranty
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!

Product Specifications

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