Introduction
Stihl weed eaters are renowned for their durability, power, and ability to tackle overgrown grass, weeds, and tough vegetation with ease. Like any outdoor power equipment, however, they require regular maintenance to perform at their best. One of the most common and routine maintenance tasks for Stihl trimmer owners is replacing worn-out trimmer line, also known as relining the Stihl head. Learning how to reline Stihl weed eater? is a simple, cost-effective skill that saves you money on replacement heads and keeps your equipment running smoothly between mowing seasons. Unlike older trimmer models that required specialized tools or professional service, modern Stihl heads are designed for quick, user-friendly relines that take 10 to 15 minutes to complete, even for first-time DIYers. This comprehensive guide walks you through every step of the Stihl head reline process, from gathering the right tools to troubleshooting common issues, so you can get back to trimming your lawn or job site in no time.
- Understanding Your Stihl Weed Eater Trimmer Line
- Tools and Materials Needed for Stihl Head Reline
- Step-by-Step: How to Reline Stihl Weed Eater
- Stihl Head Reline Comparison by Head Type
- Tips for Long-Lasting Stihl Trimmer Line
- Common Mistakes to Avoid When Relining Your Stihl Weed Eater
- Frequently Asked Questions
- Conclusion
Understanding Your Stihl Weed Eater Trimmer Line
Before diving into the reline process, it’s helpful to understand the role of trimmer line in your Stihl weed eater’s performance, as well as the signs that indicate it’s time for a replacement. Trimmer line is the cutting component of your weed eater, spinning at high speeds to slice through grass, weeds, and small woody growth. The right line for your model and use case will deliver clean cuts, reduce wear on the engine, and minimize the risk of jams or breakage.
Stihl offers several types of trimmer line, each designed for specific cutting tasks and head compatibility. The most common options include round line (the standard all-purpose option for light residential use), square line (with flat edges for sharper cutting of thicker weeds), star or serrated line (with notches for aggressive cutting of dense vegetation), and heavy-duty polymer line (reinforced for maximum durability in rocky, debris-heavy areas). Always check your Stihl weed eater’s manual to confirm the correct line diameter for your model, as using the wrong size can damage the spool, head, or engine. Most residential Stihl models use .080-inch diameter line, while commercial-grade models may require .095-inch or larger line for heavy-duty use.
Knowing when to replace your trimmer line will prevent poor cutting performance and unnecessary strain on your equipment. Common signs that it’s time to reline your Stihl weed eater include: the line is worn down to 3 to 4 inches in length, leaving insufficient cutting surface; the line breaks frequently during normal use even when avoiding obstacles; the line fails to advance when you bump the head on the ground (for bump feed models); or you notice uneven cuts or the engine sputters when engaging the trimmer head. As a general rule, residential users should plan to reline their Stihl weed eater every 2 to 4 weeks during peak growing season, while commercial users may need to reline daily depending on usage.
Tools and Materials Needed for Stihl Head Reline
One of the biggest advantages of learning how to reline Stihl weed eater is that the process requires minimal, easy-to-find tools and materials. You likely already have most of what you need in your garage or toolbox, and replacement trimmer line is inexpensive and widely available at hardware stores, home improvement centers, and online retailers.
Gather the following tools before starting the reline process to avoid interruptions: work gloves to protect your hands from sharp line edges and debris; safety glasses to prevent eye injury from flying debris or snapped line; wire cutters or heavy-duty scissors to cut new line to the correct length; a flathead screwdriver (optional, required for some older Stihl head models to remove the spool or cover); and a small brush or compressed air (optional) to clean grass clippings and debris out of the trimmer head housing before installing the new line.
For replacement line, always use trimmer line that matches the diameter specified in your Stihl weed eater’s owner’s manual. Stihl’s OEM trimmer line is engineered to work seamlessly with Stihl heads, but high-quality third-party lines from reputable brands are also a cost-effective option for most users. Avoid cheap, low-quality line, as it breaks easily, wears down quickly, and can damage your trimmer head’s feed mechanism. For most residential Stihl models, .080-inch round or square line is the best all-around choice, while commercial users may prefer .095-inch star or heavy-duty polymer line for maximum durability.
Step-by-Step: How to Reline Stihl Weed Eater
The exact reline process may vary slightly depending on your Stihl head model (bump feed, fixed line, or automatic feed), but the core steps are consistent across all models. Follow this guide to reline your Stihl weed eater quickly and correctly, and refer to your owner’s manual for model-specific instructions.
- Prepare the weed eater for relining: Start by disconnecting the spark plug wire to prevent accidental starting. Locate the spark plug on the side of the engine, then pull the rubber boot off the spark plug. Lay the trimmer on a flat surface with the head facing up, then remove the trimmer head cover by pressing the release tabs on its side (or use a flathead screwdriver for older models) to expose the spool inside.
- Remove the old trimmer line: Pull the loose end of the old line to unwind it completely from the spool, using wire cutters to snip it if it is stuck. Remove the spool from the head housing by sliding it out or twisting it counterclockwise, depending on your model. Use a small brush or compressed air to clean out any grass clippings, dirt, or debris from the inside of the head housing, as built-up debris can cause jams and uneven line feeding later.
- Load the new line into the spool: Cut the new trimmer line to the length specified in your owner’s manual (10–12 ft for single-line heads, 20 ft total for dual-line heads). File down any sharp edges on the cut ends to prevent snagging. Insert one end of the line into the hole in the spool (or one end per line for dual-line heads), then wind the line evenly onto the spool in the direction marked on the spool (usually clockwise), leaving 4–6 inches of line sticking out of the hole. Do not overfill the spool, as excess line will bunch up and cause jams. Tuck the loose line ends into the notches on the spool edge to hold them in place.
- Reassemble and test the head: Align the tabs on the spool with the slots in the head housing, then slide the spool back into place (twist clockwise until it clicks for some models). Snap or screw the head cover back on, making sure it is seated flush. Reconnect the spark plug wire, then pull the starter cord 2–3 times to start the trimmer. Let it run at idle for 30 seconds, then accelerate to full speed to check for smooth operation. For bump feed heads, bump the head lightly on the ground to confirm the line advances automatically. If the line does not advance, turn off the trimmer, remove the cover, and check that the line is wound in the correct direction and not tangled.
Stihl Head Reline Comparison by Head Type
Stihl offers several different trimmer head designs, each with unique reline requirements and use cases. Use the comparison table below to understand the differences between the most common Stihl head types, and identify which one matches your model.
| Head Type | Line Capacity | Reline Difficulty | Best Use Case | Key Reline Notes |
|---|---|---|---|---|
| Bump Feed Single Line | 10–12 ft of .080″ line | Easy (5–10 minutes) | Light residential trimming around sidewalks, gardens, and small lawns | Wind line in the direction marked on the spool, leave 4–6 inches of line sticking out for feeding |
| Bump Feed Dual Line | 20 ft total (10 ft per line) of .080″ line | Moderate (10–15 minutes) | Medium residential and light commercial trimming of medium to large lawns | Wind each line separately to avoid overlapping, ensure both lines are the same length for balanced cutting |
| Fixed Line Head | 2 pre-cut lines (10–12 ft each) | Very Easy (5 minutes) | Heavy commercial use where line breaks frequently, trimming near rocks and debris | No winding required, simply clip the pre-cut lines into the head’s line holders |
| Automatic Feed Head | 30+ ft of .095″ line | Moderate (15–20 minutes) | Large property commercial use, extended trimming sessions without frequent reloading | Wind line evenly to prevent jams, ensure line is seated properly in the feed mechanism before reassembling |
Tips for Long-Lasting Stihl Trimmer Line
Proper maintenance and usage habits will extend the life of your trimmer line and reduce how often you need to reline your Stihl weed eater. Follow these best practices to get the most out of your line and your trimmer:
- Use the correct line diameter for your model: Using line that is too thin can cause it to break easily, while line that is too thick can overload the spool and damage the head’s feed mechanism. Always refer to your owner’s manual for the recommended size.
- Do not overfill the spool: Leave a small gap between the wound line and the edge of the spool to prevent bunching and jams. Overfilled spools are the most common cause of line feed issues.
- Avoid cutting near hard obstacles: Rocks, curbs, sidewalks, and tree trunks will quickly wear down or snap trimmer line. Keep the trimmer head 1 to 2 inches above the ground when working near these surfaces, and consider using heavy-duty polymer line if you frequently trim in rocky areas.
- Store extra line in a cool, dry place: Exposure to sunlight, moisture, and extreme temperatures can make trimmer line brittle and prone to breakage. Keep unused line in a sealed container in a shaded, temperature-controlled area.
- Clean the head housing every 3 to 4 relines: Built-up grass clippings and dirt can interfere with the spool’s movement and cause the line to feed unevenly. Use a small brush or compressed air to clean the housing each time you reline the head.
- Do not manually pull out excess line: While it may be tempting to pull extra line out by hand when you need more cutting length, this can damage the feed mechanism and cause the line to advance unevenly. Use the bump feed function as intended, or adjust the line length by winding more line onto the spool if needed.
Common Mistakes to Avoid When Relining Your Stihl Weed Eater
Even experienced DIYers can make errors during the reline process that lead to poor performance, damaged equipment, or even injury. Avoid these common mistakes to ensure a smooth, successful reline every time:
- Skipping the spark plug disconnect step: Failing to disconnect the spark plug wire is the most dangerous mistake you can make. An accidentally started weed eater can cause serious lacerations from the high-speed spinning line. Always disconnect the spark plug before touching the trimmer head.
- Winding the line in the wrong direction: Most Stihl spools have an arrow printed on them indicating the correct winding direction (usually clockwise). Winding the line backward will prevent it from feeding properly, causing it to jam or not advance when you bump the head.
- Using the wrong line diameter: As mentioned earlier, using line that is too thin or too thick for your head can cause breakage, jams, and damage to internal components. Double-check your manual’s recommended line size before purchasing replacement line.
- Overloading the spool: Cramming as much line as possible onto the spool may seem like a good way to reduce how often you reline, but it will cause the line to bunch up inside the head, leading to jams, overheating, and premature wear on the feed mechanism. Stick to the line length and capacity recommended for your head model.
- Skipping the head cleaning step: Failing to remove grass clippings and debris from the head housing before installing a new spool will trap debris between the spool and housing, causing the spool to stick and the line to feed unevenly.
- Forcing the head cover into place: If the cover does not snap or screw into place easily, do not force it. This indicates that the spool is not seated correctly, or the line is tangled. Remove the cover, check the spool alignment, and adjust the line before trying to reattach the cover.
Frequently Asked Questions
How often should I reline my Stihl weed eater?
The frequency of relining depends on how often you use your weed eater and the conditions you trim in. For residential users who trim 1 to 2 times per week during the growing season, you will likely need to reline every 2 to 4 weeks, or when the line is worn down to 3 to 4 inches. Commercial users who trim daily may need to reline their Stihl weed eater once per day or even multiple times per day if working in dense, abrasive vegetation. Always inspect your line before each use to catch wear early and avoid poor cutting performance.
Can I use third-party trimmer line on my Stihl?
Yes, you can use high-quality third-party trimmer line on your Stihl weed eater, as long as it matches the diameter specified in your owner’s manual. Stihl’s OEM line is engineered for optimal performance and durability, but reputable third-party brands offer comparable quality at a lower cost. Avoid cheap, no-name trimmer line, as it is often made from low-quality materials that break easily, wear down quickly, and can damage your trimmer head’s feed mechanism. For best results, choose third-party line that is specifically labeled as compatible with Stihl trimmer heads.
Why does my trimmer line keep breaking after relining?
Frequent line breakage after relining is usually caused by one of four issues: using the wrong line diameter for your model, overfilling the spool, winding the line in the incorrect direction, or trimming near hard obstacles like rocks and curbs. First, double-check that you are using the correct line size for your Stihl head. Next, confirm that you did not overfill the spool, and that the line is wound in the direction marked on the spool. Finally, adjust your trimming habits to avoid contact with hard surfaces, or switch to heavy-duty polymer line if you frequently trim in rocky or debris-heavy areas.
Do I need to wear gloves when relining?
Yes, wearing work gloves during the reline process is highly recommended. New trimmer line has sharp, cut edges that can easily slice through skin, and old line may have burrs or rough spots from wear. Gloves also protect your hands from sharp edges on the trimmer head cover and spool, as well as any debris or grass clippings inside the head housing. Safety glasses are also recommended to protect your eyes from flying debris or snapped line.
How much trimmer line do I need for a Stihl head?
The amount of line you need depends on your head model. Most single-line bump feed Stihl heads require 10 to 12 feet of line, while dual-line bump feed heads require 20 feet total (10 feet per line). Fixed line heads require two pre-cut lines of 10 to 12 feet each, and automatic feed heads may require 30 feet or more of line. Always check your owner’s manual for the exact capacity of your specific head model to avoid overfilling or underfilling the spool.
Conclusion
Learning how to reline Stihl weed eater? is one of the simplest and most cost-effective maintenance skills any Stihl owner can learn. The process takes as little as 10 minutes, requires only basic tools, and costs a fraction of the price of replacing an entire trimmer head. By following the step-by-step guide outlined in this article, using the correct line for your model, and avoiding common mistakes, you can keep your Stihl weed eater running at peak performance all season long. Regular relining also extends the life of your trimmer head and reduces unnecessary strain on the engine, saving you money on repairs and replacements over time. Whether you’re a homeowner tackling a small yard or a commercial landscaper managing large properties, mastering the Stihl head reline process will make your outdoor maintenance tasks faster, easier, and more efficient.