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
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
Requirements
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
Specifications
