O.S. Engine OSMG0930 FS-120S-E 4-Stroke Airplane Power Unit  [OSMG0930]

O.S. Engine FS-120S-E
Price:
CAD$645.04
Brand:
O.S. Engine
Model:
OSMG0930
Please kindly input your name and email address, we will inform you once we have the restocking.
Or you may find similar product under the
category
Write a review

O.S. Engine OSMG0930 FS-120S-E 4-Stroke Performance Core

For RC flyers who prioritise reliable horsepower and smooth operation, the O.S. Engine FS-120S-E delivers proven 4-stroke engineering. Part of the Surpass Series, this unit handles larger props and provides stable output for a range of model sizes and flying styles.

Front-Mounted Camshaft Design

The FS-120S-E uses a helix gear-driven camshaft at the front to refine valve timing and reduce mechanical noise, promoting consistent running. A rear updraft carburetor supports dependable fuel flow and efficient combustion under varying flight loads.

Propeller and Setup Flexibility

This engine accepts a wide selection of propellers so model builders can tune thrust and response. Typical recommended props include sizes from 13x11 up to 17x6, allowing adjustment for climb rate, cruise speed, or scale appearance.

Specifications

  • Displacement: 1.218 cu in
  • Bore: 1.197 in
  • Stroke: 1.085 in
  • Practical RPM: 2,200-11,000
  • Output: 1.90 hp @ 11,000 rpm
  • Weight: 30.5 oz
  • Recommended Props: 13x11, 13x12, 14x10, 14x11, 15x8, 16x6, 16x7, 17x6

Experienced hobbyists will find the FS-120S-E a dependable option for models that need consistent 4-stroke power and long-term durability.

How does the helix gear camshaft influence running characteristics?

The helix gear-driven camshaft promotes smoother valve timing and reduced mechanical lash, helping the engine run evenly across the rev range and improving long term reliability.

What type of fuel should be used with this engine?

Use a quality 4-stroke glow fuel and follow O.S. Engine break-in and tuning recommendations to ensure proper lubrication and performance.

Which prop sizes are suitable for different flying styles?

Smaller-diameter, higher-pitch props favour top speed, while larger-diameter props with lower pitch deliver stronger climb and static thrust. The published range lets you choose the best compromise.

Is this engine easy to maintain between flights?

Routine 4-stroke maintenance applies: check mounting hardware, inspect the carburetor and throttle linkage, and follow post-run care to prevent corrosion and ensure consistent starts.

Copyright © 2008-2026 rcjaz.ca All rights reserved