Stihl Trimmer help

Discussion in 'Lawn Mowing' started by millenium_123, Jan 19, 2010.

  1. millenium_123

    millenium_123 LawnSite Member
    Messages: 186

    I have a stihl trimmer FS 45. Does not run properly. I replaced the carb and it runs now, but it doesn't have as much power as it should. Spark arester has been removed some time ago. Also replaced spark plug. Can I adjust the carb? I really don't know much about them. Thanks!
  2. theheisk

    theheisk LawnSite Member
    Messages: 173

    You may get better results if you posted this in the repair forum. I have received some good advice on there.
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  3. AzLawnMan

    AzLawnMan LawnSite Senior Member
    Messages: 409

    You can adjust the carb, just be careful. I would adjust it a little to where you like it. At least 3 minutes, then take out the spark plug and see what color it is. If its black then its running to rich, if its white then its running lean, if its brown then your perfect. Its very important you do this cause you can damage the engine.
  4. MikeKle

    MikeKle LawnSite Platinum Member
    Messages: 4,253

    Make sure your plug is gapped properly, I have made this mistake a few times thinking it was something more than it was.
  5. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Very true, in that section folks might tell you how it could be the throttle cable
    didn't get put back exact when you replaced the carb, perhaps it's not routed
    through the channels like it's supposed to or maybe it needs adjusting because
    it sounds like it might not be getting to WOT.

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