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Next Shipment August 2025

120AX Ringed 1.20 Airplane Glow Engine without Muffler

Item No.
OS Engines - OSMG0651
3.7
$354.85
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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

Bore
1.197" (30.4mm)
Crankshaft Threads
UNF5/16-24
Crankshaft Type
Threaded
Cylinder Type
Steel liner and piston
Cylinders
Single
Displacement
1.218 cu in (19.96cc)
Engine (Only) Weight
20.88 oz (647 g)
Plug Type
O.S. #8
Power Type
Glow
Product Height
4.3" (109.2mm) from bottom of crankcast to top of cylinder head
Product Length
3.9" (100.2mm)
Product Width
2.6" (67mm) at mounting tabs
Prop Range
15x10-12, 16x8-10
RPM Range
1,800 - 9,500 RPM
Starter Type
Hand Held Starter
Stroke
1.083" (27.5mm)

Product Details

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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
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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