O.S. Engines

FS81-a Series 4-Stroke Engine

Packing more power into 60-size planes!

The FS81-a 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, while the specially designed lubrication system eliminates the need for crankcase ventilation. Its carburetor is venturi-equipped, reducing the chance of fuel leaks, while also creating more positive air/fuel flow.
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

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