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  1. DiyGuy

    Stihl Trimmer FS-90 revs hard and spins when idling

    Great, I already have the air filter off and plan to take a video of the carb with the engine running soon. ** Updates from trouble shooting today: - With engine off and air filter removed, it looks like the throttle plate opens and closes properly, and the lever attached to the throttle cable...
  2. DiyGuy

    Stihl Trimmer FS-90 revs hard and spins when idling

    Ok I think we really might be onto something with that screw. How would I adjust it to have some slack?
  3. DiyGuy

    Stihl Trimmer FS-90 revs hard and spins when idling

    I'll take a look at the internals of the cable tommorow as well as examine the carb plate without the air filter. When running the weedeater, it did seem like the metal piece that attaches on the throttle cable on the carb end moved up and down as it should. I am also wondering what that torx...
  4. DiyGuy

    Stihl Trimmer FS-90 revs hard and spins when idling

    There are 3 screws on my trimmer the bottom is supposed to adjust idle speed, but nothing happens regardless of how much I turn it. The top two screws function as they should. I followed Steve's Small Engines guide for resetting and tuning the carb. No matter what the bottom idle screw does...
  5. DiyGuy

    Stihl Trimmer FS-90 revs hard and spins when idling

    When I run my Stihl FS-90, the trimmer head spins and it is revving pretty hard while idling. This seems to have started happening after I did a tune-up (spark plug, fuel filter, air filter). Not sure what could have made it happen, I thought maybe I accidentally turned the carb screw. I have...
  6. DiyGuy

    Stihl Trimmer FS-90 revs hard and spins when idling

    When I run my Stihl FS-90, the trimmer head spins and it is revving pretty hard while idling. This seems to have started happening after I did a tune-up (spark plug, fuel filter, air filter). Not sure what could have made it happen, I thought maybe I accidentally turned the carb screw. I have...
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