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stihl fs45 problem

Discussion in 'Mechanic and Repair' started by watlingjon, Apr 19, 2004.

  1. watlingjon

    watlingjon LawnSite Member
    from U.K
    Messages: 2

    I have a stihl fs45. i can start it, but as soon as you touch the throttle, it just tries to die. i have tried to tune it but that makes no difference.
    if you pull the throttle right in, it will stop. what should i do,
  2. sawman65

    sawman65 LawnSite Senior Member
    Messages: 754

    hello jon,
    sounds like your exaust could be pluged. been useing stihl oil mix? if you don't the exaust will plug up.also aircooled engines need to be run wide open this will burn off carbon deposites so they won't buil up
    pull the exaust screen out of the muffler and throw it away it should run fine then
  3. LeoS818

    LeoS818 LawnSite Member
    Messages: 122

    Check that all the wiring is in place in the handle.
  4. BW4486

    BW4486 LawnSite Member
    Messages: 243

    I agree

    Also take the actual muffler off and turn it where the port is facing down and scrape the buildup from the exhaust port

    FS45 is a homeowner model and that could be part of the problem
  5. watlingjon

    watlingjon LawnSite Member
    from U.K
    Messages: 2

    I took the exhaust off, but i dont no what you mean by takng the screen out. There was no carbon build up in the exhaust. even when i started it without the exhaust, it still had the same problem.
    The electrics seem o.k,
    i think there is too much fuel getting to it, coz when you touch the throttle, it sprays loads.
    what shall i do now
  6. martinw

    martinw LawnSite Member
    Messages: 23

    What type carb is on that model (the box one- or the one with a cable going in the top?) sounds like a good adjust might help (maybe replacing the diaphrams too).
  7. mudpie

    mudpie LawnSite Member
    Messages: 45

    try this there are two adj. screws on carb. one marked H the other marked L turn the one marked L anti-clockwise a little 1/8 or 1/4 turn and see if this helps
  8. sawman65

    sawman65 LawnSite Senior Member
    Messages: 754

    it has no adjustment screws and if it does they will have caps on them all you will do is ruin it take it to your dealer or buy a new one they are on sale now for $139.00 with a ten dollar rebate so it will only cost you 129.00 plus tax
  9. Kohls Landscaping Co

    Kohls Landscaping Co LawnSite Member
    Messages: 188

    had the same exact problem not to long ago on the same hedge trimmer. tried to give it gas and it started to 'bog' down and would eventually die.

    the 'spark' arrestor screen has to be unscrewed from the muffler..once it it unscrewed, the problem should be solved...

    talked to the dealer not long ago and the 'spark' arrestor screen shouldn't be a problem if you're using the correct gas/oil ratio. but it doesn't void the warranty if you take it off or anything...

    let us know if that's the problem...

  10. joe stihl

    joe stihl LawnSite Member
    Messages: 35

    Change the fuel line. 99% sure it is cracked somewhere.

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