The FS81-a mounts easily in the same space as the FS-70SII – with no modifications! A rubber O-ring on the muffler's multi-positional manifold helps prevent oil leakage, while the specially designed lubrication system eliminates the need for crankcase ventilation. Its carburetor is venturi-equipped, reducing the chance of fuel leaks, while also creating more positive air/fuel flow.

Features
- Displacement: 0.81 cu in (13.26 cc)
- Bore: 1.09 in (27.7 mm)
- Stroke: 0.87 in (22.0 mm)
- Weight w/muffler: 20.11 oz (570 g)
- Output: 1.3 hp @ 11,000 rpm
- Practical rpm range: 2200-10,000

Includes: 60RA carburetor, F-5030 muffler