2 year warranty OS EnginesGet .50 size power into your .40 size aircraft

The 55AX is better than ever, with an improved carburetor and muffler. You get the same phenomenal power, with the convenience and safety of a rear angled needle valve on the carb and a squared off muffler for easier cowling installation. If you want .50 scale power that fits conveniently in .40 size planes, get the 55AX and get flying!

  • Comes with the E3071 muffler for quiet efficiency.
  • 40K carburetor has a diagonally placed needle valve so you don't need a remote needle valve.
  • Mounts directly into the bolt pattern for the 46AX.
  • Advanced Bimetallic Liner (ABL) uses two alloys to provide a durable layer between the brass liner and piston.
  • Recommended prop sizes: 12x7, 12x8, 13x6, 13x7.

Muffler 55AX

The large-chambered muffler reduces sound without reducing power.

Carburetor 40K

The 40K carburetor includes a diagonally placed needle valve so there's no need for a remote needle valve.

Product Specifications

Crankshaft Threads 1/4-28
Muffler Weight 4.23 oz (120 g)
Cylinders Single
Product Width 2.4" (61mm) at mounting tabs
Muffler Type 2-piece aluminum
Product Height 3.6" (91.1mm) crankcase botton to top of cylinder head
Prop Range 11x6 - 13x6
RPM Range 2,000 - 17,000
Displacement 0.545 cu in (8.93cc)
Oil Type & Content At least 16% synthetic lubricant
Product Length 3.4" (85.5mm) from back plate to front of drive hub
Bore 0.91" (23mm)
Crankshaft Type Threaded
Power Type Glow
Plug Type O.S. #8
Stroke 0.85" (21.5mm)
Engine (Only) Weight 0.89lbs (404g)
SKU OSM15612
Barcode # 4531028022812
Brand OS Engines
Shipping Weight 1.0000kg
Shipping Width 0.250m
Shipping Height 0.200m
Shipping Length 0.300m
Shipping Cubic 0.015000000m3

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