The Tradition Continues…
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.
- The adjustable F-5030 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 FL-70 and the FS-70 Ultimate for easy replacement.
- A reversible carb and narrower camshaft housing simplify installation.
- Tighter tolerances and updated engineering reduce maintenance and ease set-up.
- Delivers more performance power to sport pilots and more realistic flight to scale pilots.
Key Features
- Blow-by 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°
- Adjustable F-5030 muffler for quiet operation can be rotated 360° for tight fitting applications
Product Specifications
| Manufacturer # | 34721 |
| Cylinders | Single |
| Product Width | 1.8″ (45mm) at mounting tabs |
| Total Weight | 1.2 lbs (530g) |
| Product Height | 4.2 in (108 mm) bottom of crankcase to top of rocker cover |
| Prop Range | 12×7-8 – 14 x 6-7 |
| Crankshaft Threads | UNF1/4-28 |
| Muffler Weight | 1.9 oz (54g) |
| Displacement | 0.719 cu in (11.79cc) |
| Muffler Type | 2-piece aluminum |
| Product Length | 4.1″ (103.6mm) from carb to drive hub |
| Engine (Only) Weight | 16.79 oz (476 g) |
| Bore | 1.063″ (27mm) |
| Crankshaft Type | Threaded |
| Power Type | Glow |
| Plug Type | O.S. type F |
| Stroke | 0.811 in (20.6 mm) |
| RPM Range | 2,400 – 12,000 rpm |















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