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| O.S FS 4 Stroke Engines | O.S. developed the Surpass Series of 4-stroke engines for discerning fliers who demand more power. Able to swing larger props and supply more usable horsepower, Surpass 4-strokes provide the best performance for your plane, regardless of scale or flying style.  All Surpass engines feature a helix gear-driven camshaft on the front end and dependable updraft carburetor in the back.
- All include glow plug and standard silencer.
OS Four Stroke Series
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Download OS FS 30S Manual
![[OS34810] O.S FS81a - 4 stroke engine ideal power for 60 class planes.](os_engines_pic/os_fs81a1.jpg)
![[OS35940] OS FS-200S Four Stroke motor](os_engines_pic/osmg0980.jpg)
