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Stihl String Trimmer Head Won't Spin

FS90 is a partial model number for a StihlString Trimmer. To see specific parts for your String Trimmer, please choose your exact model from the list below or choose the model that's closest.

Most Frequent Causes for String trimmer head won't spin

For the most accurate results, enter your model number.

Cause 1Trimmer Head

If the threads on the drive shaft are stripped, the trimmer head will not stay on the shaft. If this happens, replace both the trimmer head and the drive shaft.