Specification:
- Displacement: 0.809 cu in (13.26 cc)
- Bore: 1.091 in (27.7 mm)
- Stroke: 0.866 in (22.0 mm)
- Practical R.P.M.: 2,200-10,000
- Output: 1.3 hp @ 11,000 rpm
- Weight w/muffler: 20.11 oz (570 g)
- Includes: 60RA carburetor, F-5030 muffler

Now available with a PD-08 fuel pump for improved performance!

Scale modelers have enthusiastically embraced FS-a engines because they virtually eliminate oil mess while delivering excellent power. Now you can get the 81FS-a equipped with a fuel pump for even more consistent performance.

• Mounts easily in the same space as an FS-70II with no modifications
• Fuel is delivered consistently to the engine at all times, regardless of the plane's attitude, for more reliable performance.
• Ideal for aerobatics and other situations that demand high power.
• Feature the ingenious recirculation system that re-lubricates parts instead of venting the oil out into the cowl.