How Do You Restring a Stihl Weed Eater? Easy Way

Introduction

Stihl weed eaters are a top choice for homeowners and professional landscapers alike, known for their durability, power, and consistent performance. Even the most reliable tools require regular maintenance, and one of the most common upkeep tasks for any string trimmer is restringing the trimmer line. Many people search for “How Do You Restring a Stihl Weed Eater?” because the process can feel intimidating if you’ve never done it before, but it’s actually a simple, 10-minute task that saves you the cost of buying a new tool or paying for a professional repair. This comprehensive guide will walk you through every step of the process, from identifying your Stihl model and gathering the right supplies to troubleshooting common issues and avoiding costly mistakes. By the end, you’ll have all the knowledge you need to restring your Stihl weed eater quickly and confidently, no prior experience required.

• Introduction
• Understanding Your Stihl Weed Eater and Trimmer Line
• Tools and Materials You’ll Need
• Safety Precautions to Take Before Starting
• Step-by-Step Process to Restring a Stihl Weed Eater
• Restringing Different Stihl Spool Types: Bump Feed vs. Fixed Line
• Tips for Making Restringing Faster and Easier
• Common Mistakes to Avoid When Restringing a Stihl Weed Eater
• Troubleshooting Common Post-Restringing Problems
• When to Restring vs. Replace Your Stihl Weed Eater
• Frequently Asked Questions
• Conclusion

Understanding Your Stihl Weed Eater and Trimmer Line

Before you start the restringing process, it’s important to understand the basic components of your Stihl weed eater and the type of trimmer line it uses. Stihl produces dozens of weed eater models for residential and commercial use, and most fall into two categories based on their spool design: bump feed and fixed line. Each spool type works differently, and restringing steps vary slightly depending on which one you have.

Common Stihl Weed Eater Models and Their Spool Types

Popular residential Stihl models like the FS 38, FS 56 RC, and battery-powered FSA 45 all use bump feed spools, designed for casual to moderate use. These models feature a mechanism that releases more line automatically when you bump the bottom of the trimmer head against the ground. Commercial-grade models like the FS 94 R, FS 100, and FS 130 typically use fixed line spools, which require manual adjustment of line length and are built for heavy-duty, all-day use. You can find your model’s spool type listed in the user manual, or by looking at the trimmer head: bump feed heads have a small spring-loaded mechanism at the bottom, while fixed line heads have two small eyelets on the sides for line to feed through.

Types of Trimmer Line Compatible with Stihl Weed Eaters

Stihl weed eaters work with a variety of trimmer line shapes and diameters, each suited for different cutting tasks. Round line is the most common all-purpose option, ideal for cutting grass, weeds, and light vegetation. Square or star-shaped line has sharper edges that cut through thicker weeds and small brush more effectively, while serrated line is designed for heavy-duty commercial use. The most common line diameters for Stihl models are .065 inches (for light residential use), .080 inches (for medium-duty use), and .095 inches (for heavy commercial use). Always check your user manual for the exact line size recommended for your model, as using the wrong diameter can cause jams, damage the spool, or reduce cutting performance. Some Stihl models also use pre-cut line segments instead of a continuous roll, so verify the correct line type before purchasing replacement line.

Tools and Materials You’ll Need

Restringing a Stihl weed eater requires no special tools – everything you need is likely already in your garage or toolbox. Gather these supplies before you start to avoid interruptions:

• Replacement trimmer line (correct size, shape, and length for your Stihl model)
• Flathead screwdriver (for models with screw-secured spool covers; many Stihl models have twist-lock covers that don’t require tools)
• Work gloves (to protect your hands from sharp line edges)
• Clean rag (to wipe away grass clippings and debris from the trimmer head)
• Scissors or utility knife (to cut trimmer line to the correct length)
• Optional: Trimmer line lubricant (to reduce friction and extend the life of your spool)

Most of these items are inexpensive and can be purchased at any hardware or garden supply store if you don’t already have them on hand.

Safety Precautions to Take Before Starting

Taking a few simple safety steps before you start working on your weed eater will prevent injuries and damage to your tool. First, if you have a gas-powered Stihl model, disconnect the spark plug wire from the spark plug to prevent accidental starting. For battery-powered or corded models, remove the battery or unplug the tool from the outlet. Wear work gloves to avoid cuts from sharp trimmer line, and safety glasses if you’re working in an area with loose dirt, rocks, or debris. Work on a flat, stable surface so the weed eater doesn’t tip over while you’re removing parts, and make sure the engine is cool if you’ve used the tool recently to avoid burns from hot metal components. Finally, keep children and pets away from the work area while you’re handling small parts and sharp line.

Step-by-Step Process to Restring a Stihl Weed Eater

While restringing steps vary slightly depending on your spool type, the core process is the same for all Stihl weed eaters. Follow these general steps first, then refer to the spool-specific instructions later in this guide for more detailed guidance.

Step 1: Prepare the Weed Eater

Lay your Stihl weed eater on a flat, stable surface. Clear away any built-up grass, weeds, or debris from around the trimmer head using your clean rag. This makes it easier to access the spool cover and prevents dirt from falling into the internal mechanism when you remove the spool. Locate the spool cover on the bottom of the trimmer head – it’s usually secured with a small screw or a twist-lock mechanism. (See Also:How To Restring A Poulan Pro Weed Eater)

Step 2: Remove the Old Spool and Remaining Line

If your model uses a screw-secured spool cover, use your flathead screwdriver to loosen and remove the screw. For twist-lock covers, turn the cover counterclockwise until it releases. Once the cover is off, pull the old spool straight out of the trimmer head. If there’s any remaining trimmer line on the spool, pull it off and discard it. Use your clean rag to wipe away any grass clippings, dirt, or debris from the inside of the trimmer head and the spool shaft – built-up grime can cause line jams and poor feeding performance later.

Step 3: Prepare the New Trimmer Line

Measure out the correct length of replacement trimmer line for your model. Most Stihl spools hold between 10 and 20 feet of line, depending on the line diameter and spool size. Check your user manual for the exact recommended length, or mark the correct length on your line roll with a permanent marker for future reference. Cut the line to size with scissors or a utility knife. If you have a bump feed spool, fold the line exactly in half to create two equal-length arms of line; if you have a fixed line spool, leave the line as a single strand.

Step 4: Load the Line Into the Spool

For bump feed spools: insert the folded midpoint of the line into the small slot in the center of the spool. Wind each arm of the line around the spool in opposite directions, following the arrows printed on the spool (almost all Stihl bump feed spools require clockwise winding). Wind the line tightly and evenly, with no overlapping or loose loops, to prevent tangles. For fixed line spools: insert one end of the line into the small slot on the edge of the spool, then wind the line tightly around the spool in the direction indicated by the arrows. Leave 6-8 inches of line sticking out of the feed holes on either side of the spool, then tuck the loose ends into the small notches on the spool edge to hold them in place.

Step 5: Reinstall the Spool and Test the Weed Eater

Place the loaded spool back into the trimmer head, making sure the line feeds through the correct eyelets or holes in the head. Replace the spool cover, twisting it clockwise until it’s fully seated (or screwing it back in if your model uses a screw). Reconnect the spark plug wire or reinsert the battery. Turn on the weed eater and test it: for bump feed models, bump the head on the ground 2-3 times to confirm new line extends properly, and for fixed line models, check that the line extends to the correct length (1-2 inches longer than the trimmer head). Adjust the line length or spool position as needed before starting your trimming task.

Restringing Different Stihl Spool Types: Bump Feed vs. Fixed Line

While the general restringing process is the same for all Stihl models, there are a few key differences to keep in mind depending on your spool type. Follow these detailed instructions for your specific model to avoid common issues.

How to Restring a Stihl Bump Feed Spool

Bump feed spools are the most common type on residential Stihl weed eaters, and they’re designed for easy, automatic line advancement. The most important rule when restringing a bump feed spool is to wind the line in the correct direction – almost all Stihl bump feed spools require clockwise winding, as indicated by the arrows printed on the side of the spool. Winding the line backwards will prevent it from feeding out when you bump the head, leading to tangles and poor cutting performance. After winding, pull both arms of the line through the eyelets on the trimmer head before reinstalling the spool cover, to make sure they’re seated correctly. When you test the tool, bump the head firmly on a hard surface like concrete 2-3 times – you should see 1-2 inches of new line extend with each bump. If the line doesn’t feed, remove the spool and double-check the winding direction.

How to Restring a Stihl Fixed Line Spool

Fixed line spools are standard on commercial-grade Stihl models, built for heavy-duty use where accidental line advancement would be a problem. Restringing a fixed line spool is slightly different: you don’t need to fold the line in half, just cut a single length of line that’s 1.5 times the circumference of the spool. Wind the line tightly and evenly around the spool in the direction indicated by the arrows, then tuck the two loose ends into the notches on the spool edge. Make sure the line is not twisted when you reinstall the spool, as twisted line will cut unevenly and wear down faster. Fixed line models don’t have a bump mechanism, so you’ll need to manually pull out more line when the existing line wears down, or swap in a new pre-loaded spool when the line is too short to use.

Tips for Making Restringing Faster and Easier

With a few simple tricks, you can cut down the time it takes to restring your Stihl weed eater and avoid common headaches:

• Keep a spare pre-loaded spool on hand so you can swap it out in seconds when your current line runs out, instead of winding a new spool every time.
• Use a small rubber band to hold the folded ends of bump feed line in the center slot of the spool while you wind it, to keep the arms from slipping out mid-process.
• Wind the line as tightly as possible as you load the spool – loose, overlapping line is the leading cause of jams and poor feeding.
• Mark the correct line length on your trimmer line roll with a permanent marker, so you don’t have to measure every time you restring.
• Apply a small amount of trimmer oil to the spool shaft every 3-4 restrings to prevent rust and ensure smooth rotation.
• Store spare trimmer line in a sealed container in a cool, dry place to prevent it from becoming brittle from sun exposure or moisture.

Common Mistakes to Avoid When Restringing a Stihl Weed Eater

Even experienced users can make these common errors when restringing their Stihl weed eater, leading to jams, poor performance, and even damage to the tool: (See Also:What Is The Best Echo Weed Eater)

• Winding the line in the wrong direction: This is the most frequent cause of feeding issues. Always check the arrows on the spool before winding, and follow the direction indicated for your specific model.
• Using the wrong line size or shape: Line that’s too thick won’t fit through the trimmer head’s eyelets, while line that’s too thin will break easily and cut poorly. Always use the line size recommended in your user manual.
• Overfilling the spool: Winding too much line onto the spool will cause it to bulge, which prevents it from fitting back into the trimmer head and leads to tangles. Fill the spool only until the line is level with the top edge, with no bulging.
• Not securing the line ends: If you don’t tuck the loose ends of the line into the spool notches before reinstalling, they can slip out and cause the line to tangle inside the head.
• Skipping safety precautions: Failing to disconnect the spark plug or remove the battery can lead to accidental startup, which can cause serious injury. Always disable the tool before working on the head.

Troubleshooting Common Post-Restringing Problems

If you’re having issues with your weed eater after restringing, these fixes will resolve most common problems:

• Line won’t feed when you bump the head: Check that you wound the line in the correct direction, and that the line ends are tucked into the spool notches properly. If the problem persists, the bump feed mechanism may be broken and need replacement.
• Line jams inside the trimmer head: Remove the spool and rewind the line tightly and evenly, making sure there are no overlapping loops. Clean out any grass clippings or debris from inside the head before reinstalling.
• Line breaks constantly while trimming: Make sure you’re using the correct line size for your model, and that the line is wound tightly on the spool. A dull trimmer head blade can also cause line to break, so replace the blade if it’s worn down.
• Line extends too far or not far enough: For bump feed models, pull the line out to your desired length (1-2 inches longer than the head) and cut off the excess with scissors. For fixed line models, adjust the line length by pulling more line out and retying it, or replace the spool with a new one if the line is too worn.

When to Restring vs. Replace Your Stihl Weed Eater

Restringing is a cost-effective solution for most common maintenance needs, but there are times when replacing the entire tool is a better option. You should restring your Stihl weed eater if the engine runs smoothly, the head spins freely, and there’s no visible damage to the spool or trimmer head. A roll of trimmer line costs between $5 and $15, making restringing far cheaper than buying a new weed eater, which typically costs $100 or more. You should consider replacing your Stihl weed eater if the spool is cracked or broken, the head is bent, the engine won’t start or runs poorly, or the tool is more than 10 years old and has significant wear and tear. If you’re constantly experiencing jams or feeding issues even after restringing correctly, there may be a mechanical problem that requires professional repair or replacement.

Frequently Asked Questions

How Often Should You Restring a Stihl Weed Eater?

The frequency of restringing depends on how often you use the tool and what you’re cutting. For light residential use, such as trimming grass once a week, you’ll need to restring every 2-4 weeks. For heavy commercial use, like trimming thick brush daily, you may need to restring every 1-2 days. You’ll know it’s time to restring when the line is worn down to less than 2 inches, or when it breaks constantly while trimming.

What Size Trimmer Line Should I Use for My Stihl Weed Eater?

The correct line size depends on your specific Stihl model. Most residential models use .065″ or .080″ diameter line, while commercial models use .080″ or .095″ line. You can find the exact recommended size printed on the trimmer head or listed in your user manual. Using a line that’s too thick can damage the head and cause jams, while line that’s too thin will break easily and cut poorly.

Why Does My Trimmer Line Keep Jamming After Restringing?

Jamming is almost always caused by one of three issues: winding the line in the wrong direction, winding the line too loosely or overlapping on the spool, or dirt and debris inside the trimmer head. To fix it, remove the spool, check the winding direction against the arrows on the spool, rewind the line tightly and evenly, and clean out any grass clippings from the head before reinstalling. If jamming continues, confirm that you’re using the correct line size for your model. (See Also:How To Line Weed Eater)

Can I Use Aftermarket Trimmer Line on My Stihl Weed Eater?

Yes, you can use high-quality aftermarket trimmer line as long as it matches the size, shape, and specifications recommended for your Stihl model. Avoid cheap, low-quality line, as it’s often brittle, breaks easily, and can damage your trimmer head. Stihl’s own line is formulated to work perfectly with their tools, but reputable aftermarket brands like Oregon and ECHO also make compatible line that performs well.

How Much Trimmer Line Should I Load Into the Spool?

Most Stihl spools hold between 10 and 20 feet of line, depending on the model and line diameter. Overfilling the spool will cause the line to bulge, which prevents it from fitting back into the trimmer head and leads to tangles. Underfilling the spool means you’ll have to restring more often. Check your user manual for the exact recommended length for your model, or fill the spool until the line is level with the top of the spool, with no bulging.

Conclusion

Restringing a Stihl weed eater is a simple, low-cost maintenance task that anyone can complete with basic tools and a little guidance. Whether you have a residential bump feed model or a commercial fixed line model, following the correct steps for your spool type will ensure smooth, trouble-free operation for weeks or even months at a time. Remember to always take basic safety precautions first, use the correct trimmer line for your model, and wind the line tightly and evenly to avoid jams and feeding issues. By avoiding common mistakes and following the practical tips in this guide, you can save money on replacement parts and keep your Stihl weed eater running like new for years. If you’ve ever searched “How Do You Restring a Stihl Weed Eater?” looking for a clear, easy-to-follow guide, you now have all the information you need to complete the task quickly and confidently, no professional assistance required.