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  1. #1

    Join Date
    Jun 2009
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    Houston, TX
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    O.S.Engine Question

    What is the difference between the O.S.FX andSF series? Is theSF as reliable and durableas the FX?

  2. #2

    Join Date
    Oct 2006
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    Cocoa, FL
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    RE: O.S.Engine Question

    I believe the SF was the forerunner to the FX. I have a .61SF helicopter engine that must be 20 years old and it still runs like a champ with plenty of power. I would put 3&1 oil in it and let it sit for a few years between projects, mount it on another boat, and it would fire up first or second try with an electric starter. I have flipped an airboat on the ground and had it land on its side and the engine would sit there running at a perfect idle. I do not know the differences, but both are great engines. Dennis

  3. #3

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    RE: O.S.Engine Question

    Thanks Dennis...I have my eye on one right now......


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