O.S. leads the way in advanced 4-stroke engine technology, and you’ll see for yourself when you mount the FSa-72II in your model! Sport flyers will enjoy greater performance, while scale pilots will experience more realistic flight. Plus, everyone will benefit from the FSa-72II’s deep, rich sound.

Features

• The adjustable F5030 muffler can be rotated 360° and moved in or out for a perfect fit. Rich, deep sound is an added benefit.
• Features the same mounting bolt pattern as the FL70 and the FS70 Ultimate for easy replacement.
• A reversible carb and narrower camshaft housing simplify installation.
• Tighter tolerances and updated engineering reduce maintenance and ease setup.
• Delivers more performance power to sport pilots and more realistic flight to scale pilots.
• Blowby oil exits through the breather nipple on back plate for more stable operation
• Black rocker covers
• 61N aluminum body carburetor with rotary throttle lever, high speed needle valve, and low speed mixture control, extended intake tube eliminates reverse flow tendency of air/fuel mixture, carb is reversible 180°

Specifications
Displacement: 0.719 cu in (11.79cc)
Bore: 1.063" (20.7mm)
Stroke: 0.811" (20.6mm)
Max Power: 1.2PS/12,000 RPM, 1.18HP/12,000 RPM
Engine Weight: 16.79oz (476g)
Silencer Weight: 1.9oz (54g)
Practical RPM: 2,400 - 12,500
Crankshaft Thread Size: 1/4 x 28
Height from Bottom of Mounting Tab/Top of Rocker Cover: 3.5" (90mm)
Height bottom of Crankcase/top of Rocker Cover: 4.2" (108mm)
Width of Crankcase below Mounting Tabs: 1.4" (36mm)
Distance from Drive Washer to Rear of Carburetor: 4.1" (103.6mm)
Centre of Mounting Holes Same Side: 0.79" (20mm)
Centre of Mounting Holes Opposite Side: 1.8" (45mm)
Centre of Front Mounting Hole to Drive Washer: 1.9" (49.5mm)
Centre of Rear Mounting Hole to Drive Washer: 2.7" (69.5mm)
Centre of Crankcase to Center of Needle Assembly: 1.3" (33.7mm)
Muffler Angle in Relation to Engine: 11°
Needle Settings: High Speed 2.5 - 3 turns out from fully closed
Mixture Control (low speed): 2 turns out from fully closed