O.S. Engine OSMG0890 FS-91 Surpass II with Pump - Large Volume Muffler Edition  [OSMG0890]

O.S. Engine FS-91 Surpass II with Pump
Price:
£313.96
Brand:
O.S. Engine
Model:
OSMG0890
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What the FS-91 Surpass II brings to airframes

The O.S. Engine FS-91 Surpass II with Pump is designed to give pilots consistent performance and easy installation options. It is particularly useful where predictable throttle behaviour and longevity are priorities.

Fuel pump benefits for more linear power delivery

The regulating-style pump enhances fuel metering during rapid throttle changes, which helps the engine produce smoother acceleration and more reliable midrange power when flying demanding routines.

Robust plating and sealed bearing to resist wear

To guard against wear and corrosion the crankshaft, camshaft and piston ring are plated, while the rear ball bearing is rubber sealed both sides and greased internally for protection.

Reversible carburetor for convenient servicing

The reversible carburetor gives added flexibility for left or right side needle orientation, making tuning access easier and permitting tidier plumbing within many cowl designs.

Large muffler for quieter field operation

The large-volume muffler reduces exhaust noise appreciably without compromising the engine's usable power, improving the flying experience around the flying site.

Specifications

  • Displacement: 0.912 cu in (14.95 cc)
  • Bore: 1.091 in (27.7 mm)
  • Stroke: 0.976 in (24.8 mm)
  • Practical RPM Range: 2,000-12,000
  • Output: 1.6 hp @ 11,000 rpm
  • Weight with Muffler & Manifold: 23.9 oz (678 g)
  • Weight without Muffler & Manifold: 22.2 oz (630 g)
  • Recommended Props: Stunt: 11x10, 11x11, 12x9.5, 12x10, 12x11; Scale: 13.5x8, 14x7, 15x6, 16x6, 12x8 3-blade, 12.5x7 3-blade

The FS-91 Surpass II with Pump is a practical choice for pilots who need a tuneable, long lasting engine for both stunt routines and detailed scale models.

How should I set the idle and high speed needles?

Start with factory suggested settings then fine tune the idle for steady tickover and adjust the high speed needle while monitoring peak RPM under full throttle to hit recommended power figures.

Is the engine suitable for sport flying as well as competition?

Yes, the FS-91 Surpass II handles both sport and precision flying roles; its pump-fed delivery and robust construction make it versatile across different flying styles.

What maintenance intervals are typical?

Inspect after every few flights for loose fasteners and signs of wear, and perform deeper checks on bearings and seals after high hour use or if performance changes.

Can I quieten the exhaust further?

Fitting a different baffle configuration or an additional muffler chamber can reduce noise further, but always ensure back pressure does not push the engine out of its optimal power band.

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