O.S. Engine OSMG0890 FS-91 Surpass II with Pump - Stunt and Scale Powerplant  [OSMG0890]

O.S. Engine FS-91 Surpass II overview for serious RC flyers

If you fly RC aeroplanes and want a reliable powerplant, the O.S. Engine FS-91 Surpass II with Pump blends steady output with rugged construction. This engine is built to give predictable performance for pilots who push their models hard.

Pump regulation for crisper throttle response

The FS-91 Surpass II uses a regulating-style pump to improve responsiveness under changing throttle conditions. That pump technology helps maintain smoother idle-to-full transitions and is especially useful during aerobatic sequences.

Durable internals and corrosion safeguards

Engineered for longevity, the rear ball bearing is rubber sealed on both sides and pre-greased to resist corrosion. Key parts including the crankshaft, camshaft and piston ring are plated to reduce wear and extend service life.

Installation flexibility with reversible carburetor

The reversible carburetor lets you position the needle valve on either side, simplifying installation in tight cowlings and giving more options when tuning the mixture for your airframe.

Noise control via a large-capacity muffler

The large-volume muffler reduces exhaust noise for a more pleasant flying session while preserving the engine's strong power output.

The O.S. Engine FS-91 Surpass II with Pump is aimed at experienced flyers who want a robust engine for both precision aerobatics and scale flying, combining tuneable features with corrosion protection.