Stihl Carb Problem

Discussion in 'Mechanic and Repair' started by Ned5485, Sep 25, 2007.

  1. Ned5485

    Ned5485 LawnSite Member
    from Indiana
    Posts: 130

    My FS-55 trimmer was not starting all of the sudden. So, I decided to clean the carb. While taking it apart, a spring sprung out and hit me. I have looked, but have no idea where it came from. Anybody have any ideas? Or know where I can see a diagram?
     
  2. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    Most likely the metering lever spring which closes the needle against the seat. With carb mfg and numbers you may be able to find a breakdown on the internet with a little seaching.

    Dutch
     
  3. grandview (2006)

    grandview (2006) LawnSite Gold Member
    Posts: 3,466

    After you fix that doohickey check the spark screen and make sure your running premium gas.
     
  4. Ned5485

    Ned5485 LawnSite Member
    from Indiana
    Posts: 130

    Thanks, I figured it out. It was not that one. If you are interested, I dont know any of the technical terms, but it went under that little rod that serves as the axis for the butterfly valve.
     
  5. Ned5485

    Ned5485 LawnSite Member
    from Indiana
    Posts: 130

    What am I supposed to check for? My screen is hard to see through and has black goo all over. I am soaking it in solvent, but is the goo from running the low octane gas?
     
  6. grandview (2006)

    grandview (2006) LawnSite Gold Member
    Posts: 3,466

    You really don't need it unless your in California. Could be I run 93 in mine .
     

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