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

Item No.
OS Engines - OSMG0935
$687.49
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
$687.49
Product $687.49
Add Ons
Estimated Total: $687.49

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

Item No.
OS Engines - OSMG0935
4 out of 5 Customer Rating
Product $687.49
Add Ons
Estimated Total: $687.49
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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
Displacement 0.70 cu in (11.5cc)
Oil Type & Content At least 16% synthetic lubricant
Product Length 5.3" (134mm) from carb to front of drive hub
Product Height 5.5" (139.5mm) crankcase botton to top of cylinder head
Prop Range 14.9 - 16x6
RPM Range 2,000 - 12,000
Muffler Type 2-piece aluminum
Engine (Only) Weight 32.5 oz (921g) w/o muffler
Bore 1.20" (30.4mm)
Crankshaft Type Threaded
Power Type Glow
Plug Type F
Stroke 1.08" (27.5mm)
Cylinders Single
Product Width 2.6" (67mm) at mounting tabs
Crankshaft Threads UNF5/16 - 24
Muffler Weight 2.8 oz (79 g)