How to Wind Stihl Weed Eater String? AutoCut & FixCut Wind

Introduction

A tangled, underperforming Stihl weed eater is one of the most frustrating landscaping headaches a homeowner or professional landscaper can face. If you’ve ever asked yourself, How to Wind Stihl Weed Eater String? after a jammed trimmer head ruined your afternoon yard work, you’re not alone. Stihl is one of the most trusted brands in outdoor power equipment, and their weed eaters are known for durability and performance—but only when the trimmer string is wound correctly. Improperly wound string leads to frequent tangles, reduced cutting power, premature wear on your machine, and wasted time mid-job.

Stihl produces two of the most common trimmer head systems on the market: the AutoCut bump-feed head and the FixCut manual-advance head. While both systems deliver reliable performance, their winding processes are slightly different, and using the wrong method for your head type will result in a string that won’t feed correctly. This comprehensive guide will walk you through exactly How to Wind Stihl Weed Eater String? for both AutoCut and FixCut systems, along with safety tips, common mistakes to avoid, and troubleshooting advice for post-winding issues. By the end, you’ll be able to wind new string in minutes and keep your Stihl trimmer running at peak performance all season long.

• Introduction
• Understanding Your Stihl Weed Eater’s Trimmer Head System
• Tools and Materials You’ll Need
• How to Wind Stihl Weed Eater String? for AutoCut Heads
• How to Wind Stihl Weed Eater String? for FixCut Heads
• AutoCut vs FixCut: Key Differences
• Tips, Common Mistakes, and Troubleshooting
• Frequently Asked Questions
• Conclusion

Understanding Your Stihl Weed Eater’s Trimmer Head System

Before you start winding new string, the first step is to identify which type of trimmer head your Stihl weed eater uses. The two most common models are the AutoCut and FixCut systems, each designed for different use cases and operating styles.

The AutoCut system is a bump-feed design, meaning you advance the trimmer string by lightly tapping the bottom of the head on the ground while the trimmer is running. This system is extremely popular for residential use, as it allows for quick, on-the-fly string adjustments without stopping work. AutoCut heads use a looped double strand of string, which catches on an internal feed mechanism when you bump the head, automatically extending the string to the correct cutting length.

The FixCut system, by contrast, is a manual-advance design. Instead of bumping the head to feed string, you adjust the string length manually via a knob or lever on the side of the head housing. This system is built for durability and heavy use, making it the top choice for commercial landscapers, property maintenance crews, and anyone trimming thick, abrasive vegetation. FixCut heads use a single strand of string, anchored at one end of the internal spool, which you advance by turning the adjustment knob as the string wears down.

Most Stihl weed eater models will clearly label which head type they use on the head housing itself, or you can check your owner’s manual to confirm. Using the correct winding method for your head type is the most important factor in avoiding tangles and ensuring smooth operation.

Tools and Materials You’ll Need

Winding Stihl weed eater string requires no special tools or expensive equipment. Most of the items you’ll need are likely already in your garage or toolbox. Gather the following before you start:

• Replacement Stihl trimmer string: Use the exact diameter recommended for your model (most residential Stihls use .080 inch / 2.0 mm or .095 inch / 2.4 mm string; check your owner’s manual for the correct size). Using the wrong diameter will cause poor performance and can damage your trimmer’s engine.
• Work gloves: Trimmer string is sharp and can cause deep cuts if handled carelessly. A pair of leather or canvas work gloves will protect your hands during the winding process.
• Flathead screwdriver: Most Stihl trimmer heads are secured with a small retaining nut that requires a screwdriver to loosen. Some models twist off without tools, but it’s always good to have one on hand.
• Clean rag: Use this to wipe away grass clippings, dirt, and debris from the trimmer head before you start winding. Buildup inside the head can cause jams and poor string feeding.
• Small pick or wire (optional): If there is old, tangled string stuck inside the spool, a small pick or bent wire can help you pull it out without damaging the spool or head housing.

You won’t need any power tools or specialized equipment for this job, and the entire process takes 10–15 minutes once you have your materials ready.

How to Wind Stihl Weed Eater String? for AutoCut Heads

The AutoCut system is the most common Stihl trimmer head for residential users, and its winding process is straightforward once you follow the correct steps. The key difference between AutoCut and FixCut winding is that AutoCut uses a looped double strand of string, which is designed to catch on the internal feed mechanism when you bump the head.

Before winding, prep the head by disconnecting the spark plug wire to prevent accidental starting, twisting the head off the trimmer shaft (loosen the retaining nut with a screwdriver if your model has one), and clearing out all old string and debris from the spool and head housing. Make sure the string slots on the sides of the housing are clear and unobstructed.

Once the head is prepped, follow these steps to wind new string correctly: (See Also:Do You Put Weed Eater String In Water)

1. Cut a 10–15 foot length of replacement string. Fold the string exactly in half to create a loop at one end, and a pair of even strands at the other end. The loop is critical for AutoCut systems, as it catches on the internal feed mechanism when you bump the head.
2. Insert the looped end of the string into the slot on the side of the spool, and pull it through until the loop is snug against the spool. This loop will act as an anchor to keep the string from slipping out while you wind.
3. Hold the spool steady with one hand, and start winding the two strands of string around the spool tightly with your other hand. Wind in the direction of the arrow printed on the side of the spool (almost always clockwise for AutoCut heads, but confirm the arrow to avoid mistakes). Wind evenly, with no gaps or overlapping strands.
4. Stop winding when you have about 6 inches of string hanging out of each of the two slots on the sides of the spool. Do not cut the string yet—you’ll trim it to the correct length after reassembling the head.
5. Insert the wound spool back into the trimmer head housing, making sure the two loose ends of the string fit into the corresponding slots on the housing. These slots allow the string to feed out smoothly when you bump the head.
6. Reattach the head to the weed eater: twist it clockwise to lock it in place, or tighten the retaining nut securely with your screwdriver if your model uses one.
7. Pull the two loose string ends firmly to make sure they are seated fully in the housing slots. Then, trim both ends so they are even with each other, and extend 4–6 inches past the edge of the trimmer head (check your owner’s manual for the exact recommended length for your model).
8. Reconnect the spark plug wire, then test the trimmer by bumping the head on the ground 2–3 times while it’s running. The string should advance smoothly with each bump, with no tangling or jamming.

How to Wind Stihl Weed Eater String? for FixCut Heads

The FixCut system is designed for heavy-duty use, and its winding process is slightly different from the AutoCut system. Instead of a looped double strand, FixCut uses a single strand of string anchored at one end of the spool, which you advance manually via a knob on the head housing.

Prep the FixCut head the same way you would an AutoCut head: disconnect the spark plug wire, loosen the retaining nut on the bottom of the head with a screwdriver, twist the head off the shaft, and clear out all old string and debris from the spool and housing. Pay special attention to the manual advance knob and string feed slot to ensure they are not clogged.

Follow these steps to wind new string for your FixCut head:

1. Cut an 8–12 foot length of replacement string. Unlike AutoCut, you will not fold this string in half—FixCut uses a single, unlooped strand.
2. Locate the small anchor notch or hole at one end of the spool. Insert one end of the string into this notch, and pull it through about 1 inch to secure it in place. This anchor prevents the string from slipping out of the spool while you wind and while you’re trimming.
3. Hold the spool steady with one hand, and start winding the string tightly around the spool with your other hand. Wind in the direction of the arrow printed on the side of the spool (almost always clockwise for FixCut heads, but confirm the arrow to avoid issues). Wind evenly, with no gaps or overlapping strands.
4. Stop winding when you have about 6 inches of string hanging out of the feed slot on the side of the spool. Do not cut the string yet.
5. Insert the wound spool back into the trimmer head housing, making sure the loose end of the string feeds through the slot on the housing. This slot allows the string to extend when you turn the manual advance knob.
6. Reattach the head to the weed eater, and tighten the retaining nut securely with your screwdriver.
7. Pull the loose end of the string firmly to make sure it is seated fully in the feed slot. Trim the string so it extends 4–5 inches past the edge of the trimmer head (this is slightly shorter than AutoCut string, as FixCut does not require extra length for bump feeding).
8. Reconnect the spark plug wire, then test the trimmer by turning the manual advance knob on the head housing. The string should extend smoothly with each turn, with no tangling or jamming.

AutoCut vs FixCut: Key Differences

While both AutoCut and FixCut systems deliver reliable Stihl performance, their design differences mean they are better suited for different use cases. Understanding these differences will help you choose the right head for your needs, and ensure you wind the string correctly for your specific model.

The table below breaks down the core differences between the two systems:

For most residential users, the AutoCut system is more than sufficient for everyday yard work. If you regularly tackle thick overgrowth, work on large properties, or use your trimmer for commercial purposes, the FixCut system’s durability and longer string life make it a better investment. Regardless of which system you use, following the correct winding steps will ensure optimal performance and minimize downtime.

Tips, Common Mistakes, and Troubleshooting for Stihl Trimmer String

Tips for Extending Trimmer String Life and Performance

Use these best practices to get the most out of your Stihl trimmer string and avoid frequent replacements:

• Always use the exact string diameter recommended for your model (usually .080 inch for light residential use, .095 inch for thicker vegetation). Incorrect diameter causes poor performance and extra engine strain.
• Store unused string in a cool, dry place out of direct sunlight to prevent brittleness from UV exposure.
• Don’t overfill the spool: leave a small gap at the end to avoid overlapping and tangling.
• Clean the trimmer head after each use to remove grass clippings and debris that can clog feed slots.
• Opt for Stihl branded string when possible, as it is engineered for optimal performance with Stihl heads and resists breaking and tangling better than most third-party options.
• Trim string ends evenly after winding to avoid excessive vibration and premature wear on the trimmer.

Common Winding Mistakes to Avoid

These simple errors are the most common cause of tangles, jams, and poor performance after winding new string: (See Also:How To Put Oil In A Weed Eater)

1. Skipping the spark plug disconnect: Always disconnect the spark plug wire before working on the head to avoid accidental starting and serious injury.
2. Winding in the wrong direction: Always wind in the direction of the arrow on the spool. Winding against the arrow will prevent the string from feeding correctly.
3. Using the wrong string configuration: AutoCut requires a looped double strand; FixCut requires a single anchored strand. Using the wrong type will cause the string to slip out of the spool.
4. Overfilling the spool: Too much string causes overlapping and tangling inside the head. Stick to the recommended length for your model.
5. Skipping head cleaning: Failing to clear out old string and debris before winding new string leads to jams and poor feeding.
6. Using incorrect string diameter: Too-thick string strains the engine; too-thin string breaks frequently. Check your manual for the correct size.

Troubleshooting Post-Winding Issues

If you experience problems after winding new string, use these quick fixes to resolve them fast:

• String won’t advance (AutoCut): Confirm you wound the string in the correct direction, and that the string ends are seated in the housing slots. Clean the bump feed mechanism if it is jammed with debris.
• String keeps breaking: Check that you’re using the correct diameter, wind the string evenly (not overly tight), and avoid trimming over sharp rocks. Replace frayed or worn string promptly.
• Excessive vibration: Trim both string ends to the same length, and make sure the spool is seated fully in the head housing. Tighten the head securely to the shaft if needed.
• String feeds too much/too little (FixCut): Trim the string to the correct length, and adjust the manual advance knob if your model has a tension setting to control extension.
• String jams inside the head: Remove the head, clear out tangled string, and rewind following the correct steps for your head type to avoid overfilling or wrong winding direction.

Frequently Asked Questions

How often do I need to wind new Stihl weed eater string?

It depends on usage and terrain. For light residential use (1–2 times per week, short lawns), wind new string every 2–3 months. For heavy commercial use or thick, abrasive vegetation, replace it every 1–2 weeks. You’ll know it’s time when the string is worn down to less than 2 inches, or frayed and breaking frequently.

What diameter Stihl trimmer string should I use?

Most residential Stihls use .080 inch (2.0 mm) for light grass and weeds, or .095 inch (2.4 mm) for thicker vegetation. Always check your owner’s manual for the exact recommended size for your model, as using a thicker string than specified can damage your engine and trimmer head.

Can I use third-party trimmer string instead of Stihl branded string?

Yes, as long as it matches your model’s recommended diameter. However, Stihl branded string is engineered for optimal performance with their heads, and is less prone to breaking and tangling than most generic options. If you use third-party string, choose a high-quality, heavy-duty product to avoid issues.

Why is my new string tangling right after I wind it?

Tangling is almost always caused by one of three issues: winding the string in the wrong direction, overfilling the spool, or using the wrong configuration for your head type. Double-check that you followed the correct steps for your head, wound in the direction of the spool arrow, and didn’t overfill the spool. If issues persist, rewind the string to remove gaps or overlapping strands.

How much string do I need to cut before winding?

For AutoCut heads, cut a 10–15 foot length and fold it in half to create a loop. For FixCut heads, cut an 8–12 foot single strand. Always refer to your owner’s manual for the exact recommended length for your model, as larger commercial models may require longer lengths. (See Also:How Much Line To Put On Weed Eater)

Can I wind new string without removing the trimmer head?

It’s not recommended. Removing the head gives you full access to the spool, so you can clean out debris, remove old string, and wind new string evenly without tangling. Winding with the head attached increases the risk of improper winding, jams, and accidental injury if the trimmer starts unexpectedly.

Conclusion

Learning How to Wind Stihl Weed Eater String? is a simple, valuable skill that will save you time, frustration, and money on repairs and replacement parts over the life of your trimmer. Whether you use an AutoCut bump-feed head for residential yard work or a FixCut manual-advance head for heavy commercial use, the process is straightforward once you follow the correct steps for your specific head type.

The key takeaways to remember are: always disconnect the spark plug before working on the head to avoid accidental injury, wind the string in the direction of the arrow on the spool, use the correct string configuration (looped for AutoCut, single anchored for FixCut), and avoid overfilling the spool to prevent tangles. By following the safety tips, avoiding common mistakes, and using the troubleshooting advice in this guide, you can wind new string in minutes and keep your Stihl weed eater running at peak performance all season long.

If you ever run into issues you can’t resolve, consult your Stihl owner’s manual for model-specific guidance, or contact Stihl’s customer support team for assistance. With properly wound string, your Stihl trimmer will make quick work of weeds, overgrowth, and edging tasks for years to come.