stihl weedeater

Discussion in 'Mechanic and Repair' started by matt m, Aug 5, 2010.

  1. matt m

    matt m LawnSite Member
    Posts: 8

    fs 90,,,,,,,i think
    runs and runs ok i just cant seem to get it to go any higher on the rpm range no i dont have a tach but it sounds like its not getting enough fuel at hi rpms and just stops going higher tryed to adjust the hi end neddle but with no results i can get it to drop in rpm just not go up please help thanks matt
     
  2. unkownfl

    unkownfl LawnSite Gold Member
    Posts: 3,838

    Do you still have the guard on your trimmer?
     
  3. matt m

    matt m LawnSite Member
    Posts: 8

    guard?????
     
  4. mowerknower

    mowerknower LawnSite Senior Member
    Posts: 766

    In other words, shorten your line. The guard is there for a reason.
    Stihls have a governed ignition coil. So you cannot over rev.
     
  5. unkownfl

    unkownfl LawnSite Gold Member
    Posts: 3,838

    The debris guard. Many people take it off to run out the line. I have done it on my trimmer but it will not allow you to rev up. It's hard on the clutch because I have noticed some discoloring around the vent for the clutch. My same model edger doesn't have this happening and it's a year older.
     
  6. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    I am sorry but the Stihl Fs90 is a brush cutter, not the weedeater you're speaking of.
     
  7. unkownfl

    unkownfl LawnSite Gold Member
    Posts: 3,838

    Brushcutter according to Stihl... It's the same concept if he doesn't run a debris shield. It most likely has to much line out thus causing lower RPMS.
     
  8. ricky86

    ricky86 LawnSite Bronze Member
    Posts: 1,777

    4 Mix engines have a completely different sound. Get a tach.
     
  9. unkownfl

    unkownfl LawnSite Gold Member
    Posts: 3,838

    You don't need a tachometer when you know you're not hitting the limiter
     

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