O.S. Engine OSMG0935 FS-120 Surpass III with Pump - Durable 4-Stroke Powerplant  [OSMG0935]

O.S. Engine FS-120 Surpass III Engine with Pump
Price:
AUD$731.35
Brand:
O.S. Engine
Model:
OSMG0935
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Sturdy 4-Stroke Engine for Sport and Field Use

Built for enthusiasts who fly in varied conditions, the O.S. Engine OSMG0935 FS-120 Surpass III with Pump combines dependable 4-stroke torque with practical features that make field maintenance straightforward. It is engineered to deliver steady power across different flight regimes.

How the Pump and Exhaust Improve Operation

The regulating style pump improves fuel stability under changing throttle positions, while the larger muffler reduces noise levels and helps maintain backpressure for consistent combustion.

Protection and Serviceability

The rear ball bearing is pre-lubricated and sealed on both sides to keep contaminants out, and plated internals resist corrosion for extended service life. The reversible carburetor and black rocker cover simplify installation and tuning choices.

Specifications

  • Displacement: 1.2 cu in (19.7 cc)
  • Bore: 1.197 in (30.4 mm)
  • Stroke: 1.083 in (27.5 mm)
  • Practical RPM: 2,000-12,000
  • Output: 2.1 hp @ 12,000 rpm
  • Weight: 32.5 oz (920 g)
  • Recommended Props: 14x9, 14x10, 14x11, 15x8, 15x9, 15x10, 16x6

For pilots needing a hard-wearing 4-stroke that handles regular use and offers sensible upgrade paths, the FS-120 Surpass III is a practical choice.

What running surfaces suit this engine?

This engine is fine for grass strips and designated flying fields, provided you keep the intake and muffler clear of debris after takeoff and landing.

Are spare parts easy to source?

Common wear parts like gaskets, carburetor components and muffler fittings are generally available through O.S. dealers and hobby shops.

Does the reversible carb aid installation?

Yes, a reversible carb provides flexibility for mounting in different airframes and helps optimise throttle linkage setup.

How should I test the engine after fitting?

Perform ground runs with prop restraints, check for smooth idle and steady transitions to full throttle, then confirm no leaks and secure mountings before flight.

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