Mount the FSa-56II in your model, and see the difference advanced O.S. 4-stroke technology makes! Those benefits include a higher performance ceiling for sport flyers and more realistic flight for scale pilots. Plus, you’ll also enjoy rich, deep sound that will enhance your flying experience.
The popular FS56-a now features upgrades that make it even better than before!
Blow-by oil exits through the breather nipple on the back plate, for more stable operation.
Black rocker covers gives this engine a more impressive appearance.
The F-4040 silencer can be positioned to achieve the ideal fit.
Mounts with no-mod ease in the same space as the FS-56a.
Blow-by oil exits through the breather nipple on back plate for more
Black rocker covers
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
Displacement: 0.569 cu in (9.32cc)
Bore: 0.945" (24mm)
Stroke: 0.811" (20.6mm)
Engine Weight: 13.9oz (394g)
Output: 1.0 ps/0.99 hp @ 10,000 rpm
Practical RPM: 2,400 - 13,000
Crankshaft Thread Size: 1/4 x 28
Height from Bottom of Mounting Tab to Top of Crankcase:
Width of Crankcase below Mounting Tabs:
Center of Mounting Holes Same Side:
Center of Mounting Holes Opposite Side:
Center of Front Mounting Hole to Drive Washer:
Center of Rear Mounting Hole to Drive Washer:
Center of Crankcase to Center of Needle Assembly:
Center of Crankcase to Outer Edge of Needle Assembly:
Muffler Angle in Relation to Engine:
Needle Settings: High Speed: 2.5 - 3 turns out from fully closed
Low Speed: Flush with carb body
O.S. Engines FSA-56II Engine, F-4040 Silencer, Type F Glow Plug,
40NA Carburetor and Manual
Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or
a synthetic/castor 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