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120AX Ringed 1.20 Airplane Glow Engine without Muffler

Item No.
OS Engines - OSMG0651
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Product $354.85
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Estimated Total: $354.85
Estimated Total: $354.85
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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. Here’s a golden opportunity to boost your airplane's flying capabilities — with almost no modification!
  • Model Application: Ideal for 3D, Precision and Sport flying
  • Mounting Application: Mounts in same space as the .91FX
  • 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

Product Specs

Crankshaft Threads
Engine (Only) Weight
20.88 oz (647 g)
Cylinder Type
Steel liner and piston
Product Width
2.6" (67mm) at mounting tabs
1.197" (30.4mm)
Crankshaft Type
Power Type
Plug Type
O.S. #8
1.083" (27.5mm)
Product Height
4.3" (109.2mm) from bottom of crankcast to top of cylinder head
Prop Range
15x10-12, 16x8-10
RPM Range
1,800 - 9,500 RPM
Starter Type
Hand Held Starter
1.218 cu in (19.96cc)
Product Length
3.9" (100.2mm)


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Product Details

In The Box
  • (1) O.S. Max Two-Stroke 1.20AX Ringed Engine
  • (1) #8 glow plug
  • (1) Prop washer and nut
  • (1) Needle valve extension set
  • (1) Decal sheet
  • (1) Product manual
Needed to Complete
  • 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