Its running lean for one reason or another, clean replace the filter in the fuel tank, try to richen up the mixture by unscrewing the L screw on the carb by 1/4 turn if no better remove and clean internal screen in the carb
Husqvarna man
July 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix grass trimmers.