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

A big performance boost for 40-size planes!

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!

SPECIFICATIONS

• Stock Number: OSMG0956
• 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; 13×6, 12×6-8; Scale: 13×6-7, 12×6-8