How to String a Stihl Fs55r Weed Eater? Pro Model Guide

Introduction

If you own a Stihl FS55R Weed Eater, you already know how reliable and powerful this tool is for trimming grass, weeds, and vegetation around your yard. However, like any string trimmer, its performance depends heavily on properly maintained cutting line. Over time, the trimmer line wears down, tangles, or breaks, which means you will eventually need to restring the spool. Knowing how to string a Stihl FS55R Weed Eater correctly can save you money, time, and frustration compared to constantly visiting a repair shop or purchasing pre-loaded spools.

This guide walks you through everything you need to know about restringing your Stihl FS55R. From gathering tools to troubleshooting common issues, we cover each step in detail so that even beginners can follow along confidently. Whether you are dealing with a standard dual-line head or upgrading to an auto-feed system, this article provides practical advice tailored specifically for the FS55R model.

Table of Contents

• Understanding Your Stihl FS55R Trimmer Head
• Tools and Materials Needed
• Preparation Steps Before Restringing
• Removing the Old Line
• Disassembling the Trimmer Head
• Selecting the Right Trimmer Line
• Preparing the New Line
• Threading the Line Through the Head
• Winding the Line Onto the Spool
• Reassembling the Trimmer Head
• Testing the New Line
• Common Problems and Solutions
• Comparison of Trimmer Lines
• Tips and Best Practices
• Frequently Asked Questions
• Conclusion

Understanding Your Stihl FS55R Trimmer Head

The Stihl FS55R comes equipped with a bump-feed trimmer head, which automatically releases more line as needed when you tap the head against the ground during operation. This design makes it convenient for continuous trimming without frequent manual adjustments. However, understanding how this mechanism works is crucial before attempting to restring the unit.

The trimmer head consists of several key components:

• Outer Housing: The plastic casing that protects internal parts.
• Spool Assembly: Holds the trimmer line and feeds it out as required.
• Floating Plate: Allows the line to extend smoothly while preventing over-extrusion.
• Bump Mechanism: Releases additional line when tapped against a hard surface.

Before starting the restringing process, familiarize yourself with these parts. Doing so ensures that you handle each component carefully and reassemble everything correctly afterward.

Tools and Materials Needed

Having the right tools and materials on hand will make the restringing process much smoother. Here is what you will need:

• New trimmer line compatible with the FS55R (typically 2.4mm or 0.095 inches)
• Flathead screwdriver
• Phillips head screwdriver
• Clean cloth or rag
• Small container or bowl (to hold screws)
• Optional: Pliers or wire cutters

Make sure to purchase high-quality trimmer line from a reputable brand. Cheap alternatives may tangle easily or wear out faster than expected, leading to repeated maintenance tasks.

Preparation Steps Before Restringing

Safety always comes first. Follow these preparation steps before disassembling your trimmer:

1. Turn Off the Engine: Ensure the engine is completely off and cool to avoid burns.
2. Disconnect the Spark Plug Wire: Prevent accidental starts by removing the spark plug wire.
3. Work in a Clean Area: Choose a flat, well-lit workspace free of debris.
4. Gather All Tools: Keep all necessary tools within reach to avoid interruptions.

Once prepared, you can proceed to remove the old line and disassemble the trimmer head safely.

Removing the Old Line

Start by locating the end of the trimmer line protruding from the spool inside the trimmer head. Pull gently until both ends are accessible. If the line is tangled or stuck, use pliers to grasp it firmly and pull straight out.

If the line breaks during removal, do not panic. Simply extract any remaining pieces using your fingers or tools. Be careful not to damage the spool or other internal components while doing so.

Disassembling the Trimmer Head

To access the spool for restringing, you must remove the outer housing of the trimmer head. Follow these steps:

1. Locate the Release Button: Press the release button located on the side of the trimmer head.
2. Remove the Outer Cap: While holding down the release button, twist and lift off the outer cap.
3. Take Out the Spool: Carefully lift the spool assembly out of the housing.
4. Clean the Components: Use a clean cloth to wipe away dirt, grass clippings, or old adhesive from the spool and housing.

With the spool removed, you now have full access to thread and wind the new line.

Selecting the Right Trimmer Line

Choosing the correct trimmer line is essential for optimal performance. The Stihl FS55R typically uses a 2.4mm (0.095 inch) diameter line. Using a thicker or thinner line could lead to poor feeding, increased wear on the motor, or inefficient cutting.

There are also different line shapes available, including round, square, and star-shaped profiles. Round lines offer general-purpose trimming, while star-shaped lines provide aggressive cutting action suitable for thick weeds. Square lines deliver excellent durability but may not feed as smoothly in some models.

For most users, sticking with the manufacturer-recommended specifications ensures reliable results without unnecessary complications.

Preparing the New Line

Before threading the new line, prepare it properly:

1. Cut Two Equal Lengths: Measure and cut two equal lengths of line, ideally around 3 meters each.
2. Mark the Center Point: Fold one length in half and mark the center point with a piece of tape or marker.
3. Create a Loop: Form a loop at the center point to help guide the line through the spool later.

Proper preparation prevents tangles and ensures smooth winding during installation.

Threading the Line Through the Head

Now it’s time to thread the new line through the trimmer head:

1. Identify the Entry Points: Locate the small holes on either side of the spool where the line exits.
2. Insert One End: Insert one end of the line through one hole from the inside of the spool.
3. Pass Across the Spool: Route the line across the spool surface toward the opposite hole.
4. Exit Through Opposite Hole: Push the line through the second hole so that both ends hang evenly below the spool.

Ensure that the line lies flat against the spool and does not cross over itself, which could cause binding during use.

Winding the Line Onto the Spool

Proper winding technique is critical to ensure consistent line feed and prevent jams:

1. Hold Both Ends: Grip both loose ends of the line together to maintain tension.
2. Begin Winding Clockwise: Start wrapping the line around the spool in a clockwise direction, keeping tension tight.
3. Maintain Even Tension: Continue winding until only about 10–15 cm of line remains unwound at the top.
4. Secure the Ends: Tie a secure knot or leave short tails to anchor the line during reassembly.

Avoid crossing lines or creating loose coils, as these can interfere with automatic feeding mechanisms.

Reassembling the Trimmer Head

After winding the new line, carefully reassemble the trimmer head:

1. Place the Spool Back: Position the spool back into the outer housing, ensuring it sits flush.
2. Align the Components: Match the alignment marks on the spool and housing if present.
3. Reinstall the Outer Cap: Place the outer cap back onto the housing and press firmly until it clicks into place.
4. Engage the Release Button: Make sure the release button functions properly by pressing and releasing it several times.

Double-check that all parts are seated correctly and that there are no gaps or misalignments.

Testing the New Line

Before putting your trimmer to work, test the newly installed line:

1. Reattach the Spark Plug Wire: Connect the spark plug wire securely.
2. Start the Engine: Start the trimmer according to the manufacturer’s instructions.
3. Check Line Feed: Observe whether the line extends smoothly when the trimmer is idle.
4. Test Bump Feed Function: Tap the trimmer head lightly against the ground to verify that more line feeds out appropriately.

If the line fails to feed properly or jams frequently, disassemble the head again and check for twists or improper winding.

Common Problems and Solutions

Even with careful attention to detail, problems can arise during or after restringing. Below are some common issues and their solutions:

Line Jams or Tangles

Causes include incorrect winding direction, excessive line length, or using incompatible line thickness. To resolve this issue:

• Unwind the entire spool and start fresh with proper technique.
• Ensure you are using the correct line size specified for your model.
• Keep winding tension consistent throughout the process.

Line Feeds Too Slowly

This problem often stems from worn-out springs inside the bump mechanism or insufficient line tension. Try the following fixes:

• Inspect and replace the spring if damaged.
• Rewind the line with tighter tension.
• Verify that the floating plate moves freely.

Line Feeds Too Quickly

Over-wound spools or damaged bump mechanisms can cause rapid line deployment. Address this by:

• Removing excess line and rewinding with less tension.
• Checking for cracks or deformation in the bump mechanism.
• Contacting Stihl customer support for professional servicing if needed.

Comparison of Trimmer Lines

Different types of trimmer lines serve various purposes. Choosing the right one improves efficiency and reduces wear on your equipment. Below is a comparison table summarizing popular options:

Always refer to your trimmer’s manual for specific recommendations regarding line type and diameter.

Tips and Best Practices

Following best practices helps extend the life of your trimmer line and maintain peak performance:

• Use Quality Line: Invest in premium-grade line that resists fraying and breaking under pressure.
• Monitor Line Length: Regularly check the exposed line length and trim excess to prevent tangling.
  • Store Properly: When not in use, store your trimmer in a dry location away from direct sunlight.
  • Clean After Use: Wipe down the trimmer head and remove debris after each session to prevent buildup.
  • Replace Worn Parts: Periodically inspect the bump mechanism, springs, and housing for signs of wear.
  • Practice Consistent Technique: Develop a rhythm when tapping the head to control line feed and minimize waste.

  Frequently Asked Questions

  What Size Line Does the Stihl FS55R Use?

  The Stihl FS55R generally requires a 2.4mm (approximately 0.095 inches) diameter trimmer line. Always consult your owner’s manual to confirm the exact specification for your particular unit, especially if modifications have been made.

  Can I Use Any Type of Trimmer Line?

  While many trimmer lines are interchangeable, using the correct size and shape ensures optimal performance. Round lines work well for light trimming, whereas square or star-shaped lines excel in heavy-duty scenarios. Avoid using lines that are significantly thicker or thinner than recommended.

  How Often Should I Replace the Trimmer Line?

  Replace the trimmer line whenever it becomes noticeably shorter, frayed, or prone to breaking. As a rule of thumb, inspect the line before every few uses and replace it annually or as needed based on usage frequency.

  Why Is My Line Not Feeding Properly?

  Improper feeding usually results from tangled line, incorrect winding direction, or a clogged bump mechanism. Disassemble the head, clean all components, and rewind the line following proper procedures. If problems persist, consider replacing the entire spool assembly.

  Do I Need Special Tools to Restring?

  No special tools are required beyond basic screwdrivers and possibly pliers. Most homeowners can successfully restring their FS55R using common household tools.

  Is It Better to Buy Preloaded Spools?

  Preloaded spools offer convenience but tend to be more expensive than buying bulk line. If you frequently trim large areas or prefer DIY maintenance, investing in loose line and learning to restring yourself proves more economical in the long run.

  Conclusion

  Knowing how to string a Stihl FS55R Weed Eater properly empowers you to keep your tool running efficiently without relying on costly repairs or replacements. By following the steps outlined in this guide—from selecting the correct line to testing the final setup—you can ensure smooth operation and prolong the lifespan of your trimmer.

  Remember to prioritize safety, take your time during disassembly and reassembly, and refer to your user manual when in doubt. With practice, restringing becomes a straightforward task that every owner can master. Whether you are maintaining your trimmer for seasonal yard work or tackling tougher vegetation control projects, proper line management plays a vital role in achieving professional-grade results.

📌 See Also:
• → How to Rewind a Kobalt Weed Eater? Quick Tutorial
• → How to Install Echo Weed Eater Line? Easy Line Loading
• → What Is the Thickest Weed Eater String? Best Options for Tough Weeds
• → How to Load Weed Eater Cord? Cord Loading Tutorial
• → How to Change a Weed Eater Spool? Quick Restring Tutorial