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O.S. 56FS-a 34300 4-Stroke Engine OSMG0956

O.S. 56FS-a 34300 4-Stroke Engine OSMG0956
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Item #:34300

O.S. 56FS-a 34300 4-Stroke Engine OSMG0956


  • O.S. 56FS-a 4-Stroke Engine OSMG0956

  • Ushering in a new era in O.S. 4-stroke technology: the 56FS-a. It's the first in the alpha series, with the latest advancements for boosting your plane's performance.

  • Mounts with no-mod ease in the same space as the 52FS.

  • In addition to less noise, the muffler features a multi-positional manifold with a rubber O-ring that helps prevent oil leakage.

  • A newly designed lubrication system eliminates the need for crankcase ventilation.

  • The 40NA 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.

  • It's like giving your 40-size plane a new lease on life!


  • Displacement: 0.569 cu in (9.32 cc)

  • Bore: 0.945 in (24.0 mm)

  • Stroke: 0.811 in (20.6 mm)

  • Practical rpm range: 2,400-13,000

  • Output: 1.0 hp @ 10,000 rpm

  • Weight w/muffler: 16.26 oz (461 g)

  • Includes: 40NA carburetor, muffler

  • Recommended props: Sport & aerobatic; 13x6, 12x6-8; Scale: 13x6-7, 12x6-8

  • Distance Between Mounting Holes Same Side: .69" (17.5mm)

  • Distance Between Mounting Holes Opposite Side: .16" (44mm)

  • Height from Crankshaft Center to Rocker Cover: 3.3" (84mm)

  • Distance from Crankcase Center to Prop Hub: 2" (50.8mm)

  • Distance from Crankcase Center to End of Crankshaft: 3.5" (88mm)

  • Distance from Crankcase Center to Throttle Lever Center:1.3" (32.5mm)

  • Width of Crankcase Below Mounting Tabs: 1.3" (34.1mm)

  • Angle of Muffler in Relation to Engine: 11�

Package Contents

  • O.S. Max 56FS-a Four-Stroke Engine with F-4040 muffler, type "F" header pipe, glow plug, instruction manual


  • Fuel: 5-20% nitro with 18% lubricant content

  • Propeller: Sport & aerobatic; 13x6, 12x6-8

  • Scale; 13x6-7, 12x6-8  (break-in engine with prop intended for use on model)

  • Electric starter, glow starter and field equipment

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