Breathe easier with this genuine OEM air filter, part number 951-14419A, built for select Lawn Mower, Small Engine, Snowblower, Tiller, String Trimmer, Edger, Log Splitter, or Wood Chipper models from Craftsman, MTD, Troy-Bilt, or Cub Cadet.
If the string trimmer engine runs poorly the air filter might be clogged. Remove the air filter and inspect. If restricted replace with the correct filter.