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  1. #1
    Veteran Member Will_C's Avatar
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    May 2002
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    1,590
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    Upstate N.Y.
    Tractor
    B2620, Toro Z-Master 45 3 (2 3hp Kaw asaki, 52" deck.Kubota RTV 900)

    Default Stihl FS-81

    I have a chance to buy a FS-81 trimmer. Can anyone tell me how old this unit is, and what size motor it has? What is it comparable to; a modern FS 110 or 130, 250, etc.
    Thanks,
    Will

  2. #2
    Epic Contributor Bird's Avatar
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    Mar 2000
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    39,365
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    Texas

    Default Re: Stihl FS-81

    Will, I just went to stihlusa.com and using their search function for the "FS 81", it found one document, which in turn led me to manuals, and I downloaded the 46 page manual for the FS 81, 86, 106. Page 43 shows it to be 22.5 cm, (1.37 cu. in.) engine, 32mm bore, 28mm stroke. That would appear to be a smaller engine than most of the current models, but that doesn't necessarily mean it's not a good machine.
    Bird

  3. #3
    Veteran Member Will_C's Avatar
    Join Date
    May 2002
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    1,590
    Location
    Upstate N.Y.
    Tractor
    B2620, Toro Z-Master 45 3 (2 3hp Kaw asaki, 52" deck.Kubota RTV 900)

    Default Re: Stihl FS-81

    Bird,
    Thanks. I saw this trimmer on Craig's list for $150, and it appeared in good shape. It is so confusing to try and figure out Stihl trimmer numbers-my father had a FS-76 that was a real beast of a machine (I'd like one like it for some new chores I have), but this 81 is actually smaller than the FS-85 I currently own.
    Thanks. You saved me a call or a trip.
    Will

  4. #4
    New Member
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    Sep 2015
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    ky
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    kubota

    Default Re: Stihl FS-81

    Quote Originally Posted by Will_C View Post
    I have a chance to buy a FS-81 trimmer. Can anyone tell me how old this unit is, and what size motor it has? What is it comparable to; a modern FS 110 or 130, 250, etc.
    Thanks,
    Will
    I have a FS 81 i Bought in 1989 so mid to late 80s. I am looking for a gearhead box for mine if u know of any. You can no longer buy some of these beasts. Mine was the best weedeater I have ever owned but you can no longer buy many of the parts to fix it.

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