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  1. 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...
  2. 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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