Problem With STIHL Trimmers

Discussion in 'Lawn Mowing' started by Smithco Lawncare, Aug 15, 2009.

  1. TYCINC

    TYCINC LawnSite Member
    Posts: 145

    Same difference with the plug.. No i dont think its the fuel. his other equip is running fine on the same gas. . . and if the trimmers are all about the same age, given my exp with stihl over the years its the coil.
     
  2. dishboy

    dishboy LawnSite Platinum Member
    from zone 6
    Posts: 4,164

    It could be the coils, it could be ethanol in the heat, it could be the heat and lean A/F ratios of smog carbs, it could be coking, it could be gas caps not venting in the heat, it could be crap in the internal fuel circuits, or it could be a combination of any of these things. Making a blanket statement could be wrong and if a frog had wings he wouldn't bust his ass landing on rocks!
     
  3. PCSLAWN

    PCSLAWN LawnSite Member
    Posts: 29

    just remove the screens. easy fix
     
  4. Smithco Lawncare

    Smithco Lawncare LawnSite Member
    Posts: 143

    I removed the screens a long long time ago
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  5. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 13,138

    Take those units and tie them down to a bench and run them wide open to verify that it isn't the coil. Also run them in different positions. However it does sound like a starvation of fuel problem. I would replace the caps and all the fuel lines....then I would go into the carb.
     
  6. Turf Dawg

    Turf Dawg LawnSite Gold Member
    Posts: 3,719

    I never thought to ask, but what model Stihls are we talking about?
     
  7. Smithco Lawncare

    Smithco Lawncare LawnSite Member
    Posts: 143

    2 fs85's and a fs90. all around 4-5 years old.
     
  8. huttoncut1

    huttoncut1 LawnSite Member
    Posts: 17

    just curious, do you run your trimmers with the guard removed?
     
  9. Smithco Lawncare

    Smithco Lawncare LawnSite Member
    Posts: 143

    Yeah, no guard. I went to the dealer today and he said it's likely that I need to loosen the gas caps. Somebody on this thread already said that
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  10. MyKisa

    MyKisa LawnSite Member
    Posts: 59

    running w/o guard affects coil, as it actually programs the speed of trimmer....coils on these stihls seem to be a prob from time to time
     

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