Tower Hobbies
O.S. Engines® 81FS-a Series 4-Stroke Engines

Features
  • Also available in a Pumped version.
  • 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 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.
Packing more power into 60-size planes!

O.S. Engines 81FS “a” Series 4-Stroke Engine
Specifications
Displacement: 0.81 cu in (13.26 cc)
Bore: 1.09 in (27.7 mm)
Stroke: 0.87 in (22.0 mm)
Weight w/muffler: 20.11 oz (570 g)
Output: 1.3 hp @ 11,000 rpm
Practical rpm range: 2200-10,000
Includes: 60RA carburetor, F-5030 muffler
81FS-a Ringed
       LXSZW5 ONLY       Buy Now Stock Status:
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81FS-a Ringed w/Pump
       LXXWH1 ONLY       Buy Now Stock Status:

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Prices shown were current at time of ad production and are subject to change.
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