A broken starter cord prevents the engine from turning over, but fitting a new one is a manageable task for most owners. Learning how to replace the starter cord on a lawn mower can save you time and money, getting your mower running again without a trip to the repair shop. This guide will walk you through the entire process with clear, step-by-step instructions.
You will need some basic tools and a replacement cord, which is an inexpensive part. With a little patience, you can complete this repair in under an hour. Let’s get started.
How To Replace The Starter Cord On A Lawn Mower
Replacing a starter cord, also called a rewind rope, involves accessing the recoil starter assembly on the top of your mower’s engine. The process is similar for most walk-behind mowers, though there might be slight variations between brands. The key steps are removing the old cord, winding the spring mechanism, and threading the new cord.
Safety is the first priority. Always disconnect the spark plug wire to prevent any accidental starts. Make sure the mower is on a flat, stable surface before you begin working.
Tools And Materials You Will Need
Gathering the right tools before you start will make the job smoother. You likely have most of these items already in your garage.
- A replacement starter cord (check your mower’s manual for the correct length and diameter)
- Socket set or screwdrivers (flathead and Phillips)
- Needle-nose pliers
- A pair of scissors or a sharp knife
- A lighter or match (for melting the rope ends)
- Work gloves to protect your hands
- A clean cloth
Safety Precautions Before Starting
Taking a few minutes for safety can prevent serious injury. The blade is connected to the engine, and even with the spark plug disconnected, it’s best to treat the mower as if it could start.
- Disconnect the spark plug wire. Pull the boot off the plug and secure it away from the terminal.
- Ensure the mower is on level ground and the engine is completely cool.
- Wear safety glasses, especially when handling the recoil spring.
- Keep your work area clean and organized to avoid losing small parts.
Identifying Your Recoil Starter Type
Most modern mowers use a recoil starter with a pulley and spring housed in a plastic or metal casing. Some older models might have a different setup. Look for the pull handle on the top or back of the engine. The casing around it is what you’ll need to remove.
Step-By-Step Replacement Guide
Follow these steps in order. Take pictures with your phone at each stage if you’re worried about remembering how parts go back together.
Step 1: Removing The Starter Housing
First, you need to access the recoil mechanism. Locate the bolts or screws holding the starter housing to the engine cover. There are usually three or four. Use your socket set or screwdriver to remove them carefully.
Lift the housing straight up and away from the engine. Sometimes it can be stuck due to dirt or grime. Gently wiggle it free. Place it upside down on your work surface with the pulley facing up.
Step 2: Releasing The Old Starter Cord
With the housing removed, you’ll see the pulley and the coiled spring. The old cord is wound around the pulley and tied to it. Pull the cord out until you feel resistance, then use your pliers to grip the knot or clip inside the pulley.
Untie or unclip the old cord. Let the pulley spin slowly to release all tension from the spring. Be careful, as the spring can unwind quickly. Once the tension is gone, remove the old cord completely from the housing and handle.
Step 3: Preparing The New Cord
Measure and cut your new cord to match the length of the old one. It’s better to cut it slightly longer—you can always trim it later. Use the lighter to melt the cut ends of the nylon rope. This prevents it from fraying and makes it easier to thread.
Tie a secure knot at one end of the cord. A figure-eight or double overhand knot works well. You can also melt the knot slightly to help it hold. This end will attach to the pulley.
Step 4: Winding The Recoil Spring
This is the trickiest part but very manageable. The spring needs to be under tension for the cord to retract. Turn the pulley in the direction opposite of how the cord pulls out (usually clockwise) until you feel strong resistance. This winds the spring.
Many pulleys have a hole or slot to hold the spring’s tab in place while you work. If yours does, use it to keep the tension. Align the cord hole in the pulley with the exit hole on the starter housing.
Step 5: Threading And Securing The New Cord
Feed the knotted end of the new cord through the hole in the pulley from the underside. Pull it through and make sure the knot is seated securely against the pulley. Slowly release the spring tension, allowing the pulley to pull the cord into its groove.
Next, thread the other end of the cord through the exit hole on the starter housing and out the top. Pull it through until the knot on the pulley seats properly inside. Attach the pull handle using the manufacturer’s method, often a clamp or a special knot.
Step 6: Reassembling The Starter Housing
Before you put the housing back on, give the cord a few gentle pulls to test the retraction. It should pull out smoothly and snap back. If it doesn’t retract, the spring may not have enough tension and will need to be rewound.
Once it’s working, carefully place the housing back onto the engine. Align the screw holes and tighten the bolts or screws firmly but do not overtighten, especially if the housing is plastic. Reconnect the spark plug wire.
Testing Your Repair
With everything reassembled, it’s time to test your work. Make sure the area around the mower is clear. Give the starter cord a firm, full pull. The engine should turn over. If it starts, let it run for a minute to ensure everything is working correctly.
If the cord feels rough or doesn’t retract properly, you may need to open the housing again to check the cord’s path and the spring tension. Don’t worry if it takes a couple tries to get it right.
Common Problems And Troubleshooting
Even when you’re careful, you might encounter a minor issue. Here are solutions to common problems.
The Cord Does Not Retract
This usually means the recoil spring is not wound with enough tension or it has come unhooked from its anchor. You will need to open the housing again and rewind the spring, ensuring it is properly seated.
The Cord Retracts Too Slowly Or Feels Weak
The spring may have lost some of its tension over time. While you have it apart, you can carefully clean and lightly lubricate the spring and pulley post with a dry lubricant. If it’s still slow, the spring itself might be worn and need replacement.
The Cord Frays Or Breaks Quickly
This can be caused by a sharp edge on the exit hole of the housing. Feel inside the hole for any burrs. You can smooth it out with a small file or a piece of sandpaper. Also, always melt the ends of the cord to prevent initial fraying.
Maintenance Tips To Prevent Future Issues
A little maintenance can extend the life of your new starter cord and the entire recoil assembly. Follow these simple tips.
- Regularly clean around the starter housing to prevent grass and dirt buildup.
- Pull the cord straight out; yanking it at an angle causes extra wear.
- If the cord gets wet, let it dry completely before storing the mower.
- Lubricate the moving parts of the starter assembly once a season with a silicone spray.
When To Call A Professional
While this is a great DIY job, some situations warrant professional help. If the recoil spring is broken or the starter housing is cracked, you might need a whole new assembly. If you are uncomfortable handling the spring tension or the repair just isn’t working, a small engine mechanic can fix it quickly.
Frequently Asked Questions
What Is The Average Cost To Replace A Lawn Mower Pull Cord?
The cost is very low if you do it yourself. A replacement cord typically costs between $5 and $15. If you take it to a shop, labor will increase the total to around $50 to $80.
How Do You Fix A Recoil Starter On A Lawn Mower?
Fixing a recoil starter follows the same process as replacing the cord. It involves removing the housing, assessing the spring and pulley, and replacing any worn parts, not just the rope.
Can You Replace A Broken Pull Start Rope?
Yes, replacing a broken pull start rope is the exact repair outlined in this article. It is a common and straightforward fix for most lawn mower engines.
Why Does My Lawn Mower Starter Cord Keep Breaking?
Frequent breakage is often due to a misaligned or frayed exit hole, improper knotting, or a damaged pulley. It can also happen if the cord is repeatedly pulled to its full extention with excessive force.
Replacing your lawn mower’s starter cord is a satisfying repair that restores function to your machine. By following these steps, you can confidently tackle the job and enjoy a smoothly starting mower for seasons to come. Remember to always prioritize safety and take your time, especially when handling the recoil spring.