O.S. FS-120 III Surpass Ringed 4-Stroke w/Pump
Great Fall Rebate
$25 Merchandise Certificate
O.S. FS-120 III Surpass Ringed 4-Stroke w/Pump

O.S. FS-120 III Surpass Ringed 4-Stroke w/Pump

Stock# LXBY65

Building the 4-Stroke of the future, one engine at a time!

Surpass™ engines share features that include a helical gear-driven camshaft up front and a reliable rear updraft carb. Generous intake valves and CNC-machined parts add superior fit, power and compression. Rugged ringed pistons and ball bearing-supported crankshafts contribute smooth, trouble-free operation. Most also include rubber-sealed ball bearings, a reversible carb for easy installations and corrosion-resistant plating on the crankshaft, camshaft and piston.
Bore: 30.4mm (1.20") Stroke: 27.5mm (1.08") Power Output: 2.1 BHP at 12,000 rpm Practical rpm Range: 2,000 - 12,000 rpm Weight Without Muffler: 32.5oz (921g) Weight With Muffler: 35.3oz (1000g) Recommended Props: 14x9, 14x10, 14x11, 15x8, 15x9, 15x10, 16x6

O.S. Engines two year limited warranty
  • High torque for spinning bigger props.
  • Quieter, more realistic airplane sound.
  • Generous with power—stingy with fuel.
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