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16521 OS MAX-65AX (60J) W/E-4010A SILENCER


Product Description


O.S. 65AX ABL Aircraft Engine with the E4010A Muffler.


  • Ideal for trainers, sport planes and scale aircraft
  • Fits easily in the same mounting space as the O.S. 61FX ABL
  • ABL-Advanced Bi-Metallic Liner process uses a double layer of plating material rather than one thick layer. This helps the metal bond to the cylinder and makes the plating more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve for better compression and longer life.


  • O.S. 65AX ABLE4010A Muffler
  • #8 Glow Plug
  • Needle Extension Cable
  • Instruction Manual
  • Decals.


O.s. Recommends:

  • Aircraft blend fuel containing 5%-20% Nitromethane with at least 18% lubricant content.
  • Propeller: 12x6, 13x6-7 or 14x6


  • Displacement: 0.65cu in (10.63cc)
  • Bore: 0.95" (24mm)
  • Stroke: 0.93" (23.5mm)
  • Weight with Muffler: 23oz (653g)
  • Practical RPM Range: 2,500-12,000
  • Output: 1.75 hp @ 16,000 RPM
  • Crankshaft thread size: 5/16-24
  • Distance from center of engine to drive hub: 2-5/8" (65mm)
  • Distance between exhaust bolt mounting holes 42mm
  • Distance from center of engine to end of crankshaft: 4" (102mm)
  • Distance/crankshaft center to muffler exhaust outlet:1-1/2" (38mm)
  • Height from crankcase bottom to top of cylinder head 3-7/8" (98mm)
  • Height/crankshaft center to top of cylinder head: 3-1/16" (77mm)
  • Width including mounting tabs: 2-3/8" (60mm)
  • Width not including mounting tabs: 1-9/16" (39mm)
  • Width between mounting holes same side: 15/16" (25mm)
  • Width between mounting holes opposite side: 2.04" (52mm

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