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

Item No.
OS Engines - OSMG0935
$624.99
In Stock
Brand Logo
4 out of 5 Customer Rating

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

Item No.
OS Engines - OSMG0935
$624.99
Product $624.99
Add Ons
Estimated Total: $624.99

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

Item No.
OS Engines - OSMG0935
4 out of 5 Customer Rating
Product $624.99
Add Ons
Estimated Total: $624.99
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Product Details

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