Stihl FS45 Instructions

Written by vanessa ryan
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Stihl FS45 Instructions
The Stihl FS45 is effective for trimming weeds. (Jupiterimages/ Images)

The Stihl FS45 is a weed trimmer that uses a nylon line or string to cut back weeds and grass. Stihl is a company based in Virginia Beach, Virginia that manufactures and markets outdoor power tools and equipment such as brush cutters, blowers, chainsaws and trimmers, offering over 180 model variations. Operating your Stihl FS45 is not extremely difficult if you follow the correct procedure.

Skill level:


  1. 1

    Move the stop switch to the position with a "I" symbol. Press down the throttle trigger interlock and hold it there. The throttle trigger interlock is a long, slender button located just above the On/Off switch.

  2. 2

    Squeeze the throttle trigger until the catch located on the tongue is engaged in the housing. Release the throttle trigger, tongue and the throttle trigger interlock and the starting throttle position will be set.

  3. 3

    Find the choke lever and fuel pump bulb, located in the motor housing near the starter grip. Move the choke lever to the vertical line position for a cold start and the horizontal line for a warm start. Squeeze the fuel pump bulb at least five times.

  4. 4

    Position the trimmer on the ground and check to be sure the cutting string is not touching anything. Hold the trimmer with your left hand and press down with some force.

  5. 5

    Pull the starter grip out slowly until you feel it engage, and then give it one quick pull. Guide the rope back in slowly and continue until the engine is running.

  6. 6

    Squeeze the throttle until the tongue is disengaged and the engine is idling. Hold the trimmer upright with one hand on the trigger and one on the loop handle to trim weeds and grass.

  7. 7

    Move the trimmer in small, circular motions just above the ground to cut effectively. Angle it slightly forward or backward to adapt to the slope of the ground.

Tips and warnings

  • Move the stop switch to the "0" position to stop the trimmer.
  • Press down on the spool on the bottom of the trimmer to release more cutting line.

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