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FS-120 III Surpass Ringed 1.20 4-Stroke with Pump

Item No. OSMG0935
FS-120 III Surpass Ringed 1.20 4-Stroke with Pump
Brand Logo
4 out of 5 Customer Rating

FS-120 III Surpass Ringed 1.20 4-Stroke with Pump

Item No. OSMG0935
$687.49
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Product Details

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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.


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

Product Specifications

Manufacturer # 35540
Product Height 5.5" (139.5mm) crankcase botton to top of cylinder head
Prop Range 14.9 - 16x6
RPM Range 2,000 - 12,000
Crankshaft Threads UNF5/16 - 24
Muffler Weight 2.8 oz (79 g)
Cylinders Single
Product Width 2.6" (67mm) at mounting tabs
Product Length 5.3" (134mm) from carb to front of drive hub
Displacement 0.70 cu in (11.5cc)
Oil Type & Content At least 16% synthetic lubricant
Engine (Only) Weight 32.5 oz (921g) w/o muffler
Muffler Type 2-piece aluminum
Bore 1.20" (30.4mm)
Crankshaft Type Threaded
Power Type Glow
Plug Type F
Stroke 1.08" (27.5mm)