O.S. FSa-56II Airplane Engine w/F-4040 Silencer

Tower Stock# LXGUNS  •  Manufacturer Stock# 34330
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Notes from our tech department:
This is the O.S. Engines FSA-56II Four Stroke Engine with the F-4040 Silencer.


Blow-by oil exits through the breather nipple on back plate for more
stable operation
Black rocker cover
40NA carburetor
Power Box designed muffler for quiet operation is fully positionable
for tight fitting applications
Two-year limited warranty through Hobby Services beginning at date of


O.S. Engines FSA-56II Engine, F-4040 Silencer, Type F Glow Plug,
40NA Carburetor Header Pipe and Manual


Fuel: 10-20 nitromethane with 18 lubricant. Synthetic, castor, or
a syntheticcastor lubricant blend may be used.
NOTE: Certain four-cycle fuels cannot be used due to low oil content
However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15
(CATP9109) may be used due to its 18 oil content.
When choosing fuels for this engine, be sure to select a fuel with
at least an 18 lubricant content.
Propeller: Sport & Aerobatic, 13x6, 12x6, 12x7, 12x8
Scale, 13x6, 13x7, 12x6, 12x7, 12x8


Displacement: 0.569 cu in (9.32cc)
Bore: 0.945 (24mm)
Stroke: 0.811 (20.6mm)
Engine Weight: 13.9oz (394g)
Output: 1.0 ps0.99 hp 10,000 rpm
Practical RPM: 2,400 - 13,000
Crankshaft Thread Size: UNF14 x 28
Height from Bottom of Mounting Tab to Top of Crankcase: 3.3 (84mm)
Width of Crankcase below Mounting Tabs: 1.3 (34.1mm)
Center of Mounting Holes Same Side: 0.69 (17.5mm)
Center of Mounting Holes Opposite Side: 1.7 (44mm)
Center of Front Mounting Hole to Drive Washer: 1.98 (50.3mm)
Center of Rear Mounting Hole to Drive Washer: 2.6 (67.5mm)
Center of Crankcase to Center of Needle Assembly: 1.3 (32.5mm)
Center of Crankcase to Outer End of Crankshaft: 3.5 (88mm)
Muffler Angle in Relation to Engine: 11
Mounting Hole Diameter: 0.14 (3.7mm)
Needle Settings: High Speed: 2.5 - 3 turns out from fully closed
Low Speed: Flush with carb body

jxs 090617



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