O.S. FS-81-a .81 Four Stroke Glow Engine w/Muffler

This is the OS Engines 81FS-a four stroke ring engine, with 60RA carburetor and included OS F5030 muffler.  Packing more power into 60-size planes!

  • Mounts easily in the same space as the FS-70SII with no modifications.
  • A rubber O-ring on the muffler's multi-positional manifold helps prevent oil leakage.
  • The specially designed lubrication system eliminates the need for crankcase ventilation.
  • The 60RA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow.


  • Displacement: 0.809 cu in (13.26 cc)
  • Bore: 1.091 in (27.7 mm)
  • Stroke: 0.866 in (22.0 mm)
  • Weight w/muffler: 19.63 oz (556 g)
  • Practical rpm range: 2,200-12,000
  • Output: 1.3 hp @ 11,000 rpm

This product was added to our catalog on February 11, 2009.

This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
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