How to Put String in a Stihl FS 450 Trimmer

Updated February 21, 2017

The Stihl name is synonymous with high-quality, professional-grade gas-engine-powered lawn and outdoors products. Chainsaws and line trimmers are among Stihl's most popular products. The brand equity, ostensibly, applies to the Stihl FS 450 weed trimmer. To replace its string, all you need is trimmer line--no tools are required. This process takes only a few minutes to complete and will have you cutting down weeds in no time.

Cut a 14-inch line of string and bend it in half.

Remove the spool by pressing the pair of buttons on the side of the trimmer head.

Discard any leftover pieces of string and clean away any dirt.

Connect one end of the string through the connector on the top of the spool.

Wrap the first half of the string around the top half of the inside of the spool and the second half around the inside's bottom half. Wrap both halves in a counterclockwise direction.

Place the open end through the connector on the spool's bottom.

Slide the ends through the inside of the eyelets on the trimmer head.

Snap the spool into the head and pull the two ends of string tight with your hands.


Cut down weeds thicker than average yard weeds with .095mm string.


Wear gloves and safety goggles while using the trimmer.

Things You'll Need

  • New cutting line
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About the Author

Steven Diggs, Jr. has been writing professionally since 2008. His work can be seen published all over the Web, including on the Appalachian Independent website. He holds Bachelor of Arts degrees in English and history from Frostburg State University.