How to Change Weed Eater String on Ryobi? Easy Guide for Ryobi Owners

Introduction

Ryobi weed eaters are a top choice for DIY homeowners and yard care enthusiasts, thanks to their reliable performance, affordable price point, and compatibility with the brand’s popular cordless and gas-powered tool lineup. But like any outdoor power equipment, the cutting string wears out over time from friction with grass, weeds, and hard surfaces. Many Ryobi owners assume they need to pay for professional servicing or replace the entire tool when the string breaks, but that’s not the case. If you’ve been wondering How to Change Weed Eater String on Ryobi? You’re in the right place—this complete, step-by-step guide walks you through the entire process, no prior mechanical experience required. We’ll cover everything from selecting the right string for your model to avoiding common mistakes, so you can get your weed eater back up and running in 10 minutes or less.

• Preparation: Tools and Safety Gear You’ll Need
• Step 1: Identify Your Ryobi Weed Eater Model
• Step 2: Select the Correct Replacement String
• Step 3: Remove the Old, Worn-Out String
• Step 4: Prepare Your New Weed Eater String
• Step 5: Install the New String Correctly
• Step 6: Test Your Weed Eater After Installation
• Common Mistakes to Avoid When Changing Ryobi Weed Eater String
• Comparison: Ryobi Weed Eater String Types and Their Uses
• Pro Tips for Extending Your Weed Eater String’s Lifespan
• Frequently Asked Questions (FAQ)
• Conclusion

Preparation: Tools and Safety Gear You’ll Need

Before you start the restringing process, gather a few basic tools and safety gear to make the job fast and injury-free. You won’t need any specialized equipment, just items most homeowners already have on hand:

• Replacement weed eater string (correct diameter and shape for your Ryobi model)
• Work gloves (to protect your hands from sharp string edges)
• Safety glasses (to shield your eyes from flying debris during testing)
• Wire cutters (to trim string to the correct length)
• Small flathead screwdriver (for fixed-line models or prying out stuck spools)
• Small cleaning brush (to remove grass and debris from the string head)

First and foremost, prioritize safety by disconnecting your weed eater’s power source. For cordless Ryobi models, remove the battery pack fully from the tool—don’t just turn it off, as accidental button presses can start the motor. For gas-powered RY series models, disconnect the spark plug wire from the spark plug to prevent the engine from starting unexpectedly. If your gas model was recently used, wait for the engine to cool completely before touching the string head to avoid burns from hot metal.

Step 1: Identify Your Ryobi Weed Eater Model

Ryobi makes dozens of weed eater models, from lightweight 18V cordless units for small yards to heavy-duty 40V and gas-powered models for large lots and thick brush. The first step to a successful restring is identifying your exact model, as this determines the correct string size, type, and installation method.

You can find your model number printed on a label located in one of three places: on the upper shaft near the motor housing, on the bottom of the string head, or on the battery pack for cordless units. Model numbers typically start with “RY” followed by a series of numbers, such as RY40150 (a popular 40V cordless model) or RY30020 (a gas-powered RY series unit). If you can’t find the label, check your original tool packaging or the Ryobi app if you registered your tool after purchase. You can also look up your model’s specifications on Ryobi’s official website to confirm string requirements and whether it uses bump-feed or fixed-line string.

Step 2: Select the Correct Replacement String

Using the wrong string is the most common cause of poor performance, frequent breakage, and even damage to your weed eater’s motor. When selecting replacement string, focus on two key factors: diameter and shape.

Diameter: Most Ryobi residential weed eaters use either 0.080-inch or 0.095-inch round string. 0.080-inch is standard for light-duty use on regular lawns and light weeds, while 0.095-inch is better for thicker vegetation and heavy-duty models. Never use a string larger than the diameter recommended for your model—oversized string overloads the motor, reduces battery life for cordless units, and can cause the motor to burn out over time. Undersized string will break constantly when cutting thick brush.

Shape: Round string is the most common and affordable option, ideal for general lawn maintenance and edging. For thicker weeds, woody brush, and dense vegetation, choose square or serrated string, which has sharp edges that cut through tough material more efficiently. Avoid twisted string, as it can cause excess vibration and uneven cutting on Ryobi models.

You can buy pre-cut string pieces for quick restringing, or purchase a bulk roll of string and cut it to size yourself to save money. Ryobi OEM string is optimized for their tools, but reputable third-party brands make compatible string that works just as well at a lower cost—just avoid cheap, low-quality string that frays easily, as it can jam your tool and damage the string head.

Step 3: Remove the Old, Worn-Out String

Once you’ve gathered your tools and selected the correct string, it’s time to remove the old, worn-out line. Follow these steps carefully to avoid damaging your weed eater:

1. Confirm your tool is fully powered off, with the battery removed or spark plug disconnected.
2. Flip the weed eater upside down so the string head is facing up, resting on a flat surface.
3. For bump-feed models: Locate the circular cap on the bottom of the string head. Twist it counterclockwise to loosen, then pull it straight off. Next, pull the internal string spool straight out of the housing—don’t twist it, as this can break the alignment tabs on the spool. If the spool is stuck, wiggle it gently side to side to loosen it, don’t use excessive force.
4. For fixed-line models: Locate the small retaining screw on the side of the string head. Use your flathead screwdriver to loosen and remove the screw, then pull the old string out through the side hole of the head.
5. Pull out all remaining pieces of old string from the spool or head housing. Use your small brush to wipe away any built-up grass, mud, or debris from the inside of the head housing—built-up gunk is a leading cause of string jams, so a quick clean will save you headaches later.

Step 4: Prepare Your New Weed Eater String

Properly preparing your new string before installation ensures it feeds smoothly and lasts as long as possible. Follow these steps based on the type of string you purchased:

• If you bought pre-cut string pieces: Check the length against your model’s requirements (most Ryobi models need 2 pieces of string, each 6–8 inches long for bump-feed, or 8–10 inches for fixed-line). Trim with wire cutters if needed to get the correct length.
• If you’re cutting string from a bulk roll: Cut two equal lengths with wire cutters, then trim any frayed ends to get a clean, smooth cut that won’t jam when feeding.
• For bump-feed models: Fold each string piece in half evenly, and make a small crease in the middle of the fold. This crease will lock into the center hole of the spool to keep the string from pulling out while you wind it.

If you’re using serrated or square string, take extra care to keep the edges straight when cutting, so the cutting edges remain sharp for optimal performance.

Step 5: Install the New String Correctly

Installation varies slightly depending on whether your Ryobi uses a bump-feed or fixed-line system, so follow the steps for your model type:

For Bump-Feed Models

1. Take your string spool (either the original spool you cleaned earlier, or a new replacement spool). Feed the folded, creased end of one string piece into the center hole of the spool, pushing it through until the crease locks into place on the other side.
2. Wind the string around the spool in the direction of the arrow printed on the top of the spool (almost always clockwise for Ryobi models). Lay the string flat as you wind, avoiding overlaps, and wind until the string is snug but not packed tight against the spool. Leave 4–6 inches of string hanging out the bottom of the spool.
3. Repeat the process for the second string piece, making sure both strings are wound evenly and have the same length sticking out the bottom of the spool.
4. Place the spool back into the string head housing, aligning the tabs on the spool with the slots in the housing. Push the spool in firmly until it clicks into place.
5. Twist the circular cap back onto the bottom of the head clockwise until it’s tight.

For Fixed-Line Models

1. Feed the end of one string piece through the side hole in the string head, pulling it through until 4–6 inches of string is sticking out the bottom of the head.
2. Pull the string tight to remove any slack, then tighten the retaining screw with your flathead screwdriver to lock the string in place. Don’t overtighten the screw, as this can strip the threads.
3. If your model uses two lines, repeat the process for the second side hole, making sure both strings are the same length for even cutting.

Step 6: Test Your Weed Eater After Installation

Before you take your newly restrung weed eater out to the yard, run a quick test to make sure everything is working properly:

1. Reattach the battery pack (for cordless models) or reconnect the spark plug wire (for gas models).
2. Put on your safety glasses and work gloves.
3. Turn on the weed eater and let it run for 10–15 seconds. For bump-feed models, tap the bottom of the string head firmly on the ground 2–3 times to extend the string. If the string doesn’t extend, check that you wound it in the correct direction (the arrow on the spool) and that it’s not tangled inside the head.
4. Trim a small test patch of grass or weeds to check cutting performance. If the string breaks immediately, double-check that you used the correct diameter for your model, and that the string isn’t twisted or tangled in the head.
5. If the string is wobbling or cutting unevenly, turn off the tool, remove the spool, and adjust the strings so they are the same length and lying flat on the spool.

Common Mistakes to Avoid When Changing Ryobi Weed Eater String

Even experienced DIYers can make these common errors when restringing a Ryobi weed eater. Avoid them to get the best performance and lifespan from your tool:

• Using the wrong string diameter: Oversized string overloads the motor, while undersized string breaks constantly. Always check your model’s recommended size before buying replacement string.
• Winding the string in the wrong direction: This is the most common cause of jams and poor feeding. Always wind the string in the direction of the arrow printed on the spool.
• Skipping the power disconnect step: Failing to remove the battery or disconnect the spark plug can lead to accidental startup and serious injury.
• Not cleaning the string head before installation: Built-up grass and debris cause jams and prevent new string from feeding smoothly.
• Cutting the string too short or too long: Too short, and the string won’t extend properly; too long, and it will tangle inside the head. Stick to the recommended length for your model.
• Twisting the string during installation: Twisted string causes uneven cutting, excess vibration, and early breakage. Lay the string flat as you wind it to avoid twists.
• Over-winding the spool: Packing the spool too tight prevents the string from feeding correctly. Wind the string until it’s snug, but don’t apply extra pressure to pack it down.
• Using frayed or damaged string: Old, frayed string will break quickly after installation. Always use new, high-quality string for replacements.

Comparison: Ryobi Weed Eater String Types and Their Uses

Not all weed eater string is created equal, and choosing the right type for your yard’s needs will improve cutting performance and extend the string’s lifespan. Use the table below to find the best option for your Ryobi model:

Pro Tips for Extending Your Weed Eater String’s Lifespan

With proper care, you can make your weed eater string last longer and reduce how often you need to restring your tool. Follow these pro tips to get the most out of your string:

• Avoid cutting against hard surfaces: Hitting concrete, rocks, tree trunks, or fence posts wears down string incredibly fast. Try to keep the string 1–2 inches away from hard surfaces when cutting.
• Clean the string head after each use: Wipe off grass, mud, and debris from the head and spool after every use to prevent corrosion and jams.
• Store your tool properly: Keep your weed eater in a dry, cool place out of direct sunlight and rain. Prolonged exposure to the elements makes string brittle and prone to breaking. If you’re storing the tool for the winter, remove the string from the head to prevent it from warping under tension.
• Only extend as much string as you need: For bump-feed models, don’t extend the full length of the string for small jobs. Extra exposed string wears down faster when it hits obstacles, so only extend 4–6 inches for most tasks.
• Keep spare string on hand: Store a roll of replacement string in your garage or toolbox so you can restring your weed eater immediately when the string breaks, no need to make a trip to the hardware store mid-job.
• Check head alignment regularly: A misaligned string head causes uneven string wear and poor cutting performance. If you notice the string wearing down unevenly, check that the head is properly tightened to the shaft.

Frequently Asked Questions (FAQ)

How often do I need to change the string on my Ryobi weed eater?

For most residential users, you’ll need to change or restring your Ryobi weed eater every 2–4 months, depending on how often you use it and what type of vegetation you’re cutting. If you’re cutting thick brush or using the tool daily, you may need to restring it as often as once a month. Signs you need new string include fraying, broken pieces, or poor cutting performance even after extending the string fully.

What size string does my Ryobi weed eater use?

Most Ryobi residential weed eaters use 0.080-inch round string for general use, while heavy-duty models use 0.095-inch string. The exact size is listed on the label on your tool, in your user manual, or on Ryobi’s official website if you search for your model number. Never use a string larger than the recommended size, as it can damage your tool’s motor and cutting mechanism.

Can I use third-party weed eater string on my Ryobi model?

Yes, as long as the string matches the diameter and shape recommended for your specific Ryobi model. Ryobi OEM string is optimized for their tools, but many reputable third-party brands make compatible string that works just as well, often at a lower cost. Just avoid cheap, low-quality string that frays easily, as it can jam your tool and damage the string head.

Why does my new Ryobi weed eater string keep breaking?

This is usually caused by one of three issues: you installed string that’s too thin for the vegetation you’re cutting, you’re winding the string in the wrong direction causing tangles, or you’re cutting against hard surfaces. Double-check that you’re using the correct string diameter for your model and use case, and make sure you wound the string in the direction of the arrow on the spool.

Do I need to replace the entire string head when I change the string?

No, in most cases you only need to replace the string itself, not the entire head. The string head on Ryobi weed eaters is designed to be restringed dozens of times over its lifespan. Only replace the entire head if it’s cracked, the spool is broken, or the feeding mechanism is damaged beyond repair.

Can I restring my Ryobi weed eater without removing the head from the shaft?

Yes, in almost all cases you don’t need to remove the entire string head from the weed eater shaft to restring it. The spool or string retaining mechanism is accessible directly from the bottom of the head, so you can restring it while the head is still attached to the tool, which saves time and effort. Only remove the entire head if you’re replacing a damaged head, not for regular restringing.

Conclusion

Changing the string on your Ryobi weed eater is a simple, low-cost DIY task that takes 10 minutes or less, no professional help required. By following the steps in this guide, selecting the correct string for your model, and avoiding common mistakes, you can keep your tool performing at its best for years to come. Regular maintenance like restringing extends the lifespan of your weed eater, saves you money on repair costs, and ensures you’re always ready to tackle yard work whenever the need arises. So the next time your string wears out, don’t rush to buy a new tool—just follow this guide to How to Change Weed Eater String on Ryobi? and get back to trimming your lawn in no time.