O.S. Engine OSMG0890 FS-91 Surpass II with Pump - High Response Air Engine  [OSMG0890]

FS-91 Surpass II summary for model aviators

For model aviators seeking a balance of performance and durability, the O.S. Engine FS-91 Surpass II with Pump offers consistent output and thoughtful engineering. It is well suited to pilots who expect reliable behaviour from their engine across varied flight profiles.

Pump-assisted throttle stability

The built-in pump helps regulate fuel flow under changing loads, improving throttle stability during quick manoeuvres and making the engine less prone to sudden lean or rich surges.

Corrosion-resistant finishes and sealed bearing

Key moving parts receive protective plating and the rear ball bearing is double rubber sealed and greased to limit corrosion, helping the unit withstand damp conditions and long term storage.

Flexible carburetor orientation for neat installs

The reversible carburetor lets you place the needle valve on either side, which simplifies routing in tight cowl layouts and gives more tuning freedom when fitting to different airframes.

Muffler designed to lower noise without losing thrust

The large-volume muffler reduces exhaust sound while maintaining the engine's usable power band, making it easier to fly without drawing excessive attention at the field.

Overall, the FS-91 Surpass II with Pump is a dependable choice for pilots who value smooth throttle control and robust construction for both sport and scale aircraft.