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Stihl fs 85 runs great but smokes a lot. Why

Discussion in 'Mechanic and Repair' started by HenryB, Sep 27, 2009.

  1. HenryB

    HenryB LawnSite Bronze Member
    Messages: 1,844

    Title says it all. Same mix in my other 2 cycles so why does this unit smoke so much? Otherwise runs great.
  2. HenryB

    HenryB LawnSite Bronze Member
    Messages: 1,844

    Could it be too much oil in the mix. Other 2 cycles are not smoking:confused:
  3. carriedrewdog

    carriedrewdog LawnSite Member
    Messages: 68

    Carburetor rich?
  4. Alan0354

    Alan0354 LawnSite Platinum Member
    Messages: 4,450

    Dirty air filter? I usually put too much oil, no smoking problem ever.
  5. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Messages: 2,248

    As mentioned before, high speed needle may be set to rich or you may also have a spark arrestor that has carbon buildup on the screen. If you have any oily residue around the spark arrestor/muffler port that is usually a signal that the spark arrestor is starting to be restricted.


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