How To Fix Pull String On Lawn Mower

When your lawn mower refuses to start, a broken pull cord is a common culprit. Learning how to fix pull string on lawn mower is a straightforward repair that can save you time and money. A broken pull start rope on your mower can be rewound or replaced with a new assembly to restore easy starting.

This guide will walk you through both repairing a snapped rope and replacing the entire starter assembly. You’ll need only basic tools and a bit of patience. Let’s get your mower starting smoothly again.

There are two main approaches to fixing a pull string: rewinding the existing rope if it’s simply snapped, or replacing the whole starter assembly if the internal mechanism is damaged. We’ll cover both methods step-by-step.

First, gather your tools and ensure safety. Always disconnect the spark plug wire to prevent any accidental engine starts. You’ll typically need a socket set, screwdrivers, needle-nose pliers, and a replacement rope or assembly.

Tools And Materials You Will Need

Having the right items on hand makes the job smoother. Here is a basic list to prepare before you begin.

Replacement pull cord rope (check thickness and length against your old one)
Socket wrench and sockets (sizes vary by mower)
Flat-head and Phillips screwdrivers
Needle-nose pliers
Safety gloves and eye protection
A sturdy work surface
Your mower’s model number (for ordering correct parts)

Safety Precautions Before Starting

Your safety is the most important part of any repair. Never skip these critical steps.

Disconnect the spark plug wire. This ensures the engine cannot start while your hands are near the blade.
Drain the fuel or run the mower until the tank is empty to reduce fire risk.
Place the mower on a flat, stable surface. Tip it only as directed, usually with the air filter and carburetor facing up.
Wear gloves to protect your hands from sharp edges and grease.

Diagnosing The Pull Start Problem

Not all pull string issues are the same. Identify your specific problem to choose the right fix.

The Rope Is Snapped Or Frayed

This is the most common issue. The rope breaks inside the housing or at the handle. If there’s enough length left, you can sometimes re-knot it. Usually, a full re-rope is needed.

The Rope Retracts Slowly Or Not At All

This often points to a weak or broken recoil spring inside the starter. The spring provides the tension to rewind the rope. It may need repositioning or replacement.

The Pull Cord Handle Is Broken

The plastic handle can crack or the rope can pull free from it’s knot. This is a simple fix requiring a new handle or re-tying the knot.

The Starter Assembly Makes Grinding Noises

If you hear grinding or the rope won’t pull at all, the internal pulley or dogs (engagement tabs) may be damaged. This usually requires a full assembly replacement.

Method One: Rewinding Or Replacing The Pull Rope

If the internal recoil spring is intact, you can rewind a new rope into the existing starter housing. Follow these steps carefully.

Remove the starter assembly. Locate the bolts or screws holding the plastic starter housing to the engine. They are usually around the perimeter. Use your socket wrench to remove them.
Carefully lift the housing away. There may be a cover over the recoil spring. Keep everything oriented as it was.
Release the old rope. Note how the rope is wound around the pulley and anchored. Use pliers to carefully unwind any remaining rope from the pulley hub.
Prepare the new rope. Cut your replacement rope to the same length as the old one. Melt the ends slightly with a lighter to prevent fraying and tie a secure knot at one end.
Wind the recoil spring. This is the trickiest part. Turn the pulley in the direction of rope retraction (usually clockwise) until there is tension. Then, back it off slightly (about one turn) to provide slack for the rope.
Thread the new rope. Feed the un-knotted end through the exit hole in the housing and then through the hole in the pulley. Tie a solid knot on the pulley side. Ensure the rope winds onto the pulley correctly as you release it.
Reattach the handle. Feed the other end of the rope through the handle and tie a sturdy stopper knot. Pull the rope gently to test the rewind action.
Reinstall the assembly. Place the starter housing back onto the engine, aligning any tabs or guides. Tighten the bolts evenly and reconnect the spark plug wire.

Method Two: Replacing The Entire Starter Assembly

If the housing, pulley, or spring is broken, a full replacement is faster and more reliable. New assemblies are often inexpensive and come pre-wound.

Purchase the correct part. Use your mower’s model number to order a matching starter assembly. This ensures proper fit and engagement.
Remove the old assembly. As before, disconnect the spark plug and remove the bolts holding the starter to the engine. Lift it straight off.
Compare the new and old parts. Make sure the new assembly looks identical, with the same bolt pattern and engagement teeth.
Install the new assembly. Position it onto the engine shaft, aligning the holes. Hand-tighten the bolts first, then secure them firmly with your socket wrench. Do not over-tighten the plastic.
Test the pull. The new assembly should have a handle attached. Give the cord a slow, steady pull to feel the engine’s compression and ensure it engages smoothly.

Common Mistakes To Avoid

Even simple repairs can go wrong. Avoid these common pitfalls for a succesful fix.

Not disconnecting the spark plug. This is a critical safety step you must not ignore.
Letting the recoil spring fly out. When opening the housing, control the spring with your hand. If it pops out, it can be difficult and dangerous to rewind.
Using the wrong rope thickness. A rope that’s too thick or thin will not wind properly and may jam.
Over-winding the recoil spring. This puts excessive tension on the spring and can cause it to break or make the rope hard to pull.
Forgetting to melt the rope ends. Unsealed ends will fray quickly, causing the knot to fail.

Maintenance Tips To Prevent Future Issues

A little regular care can extend the life of your pull start mechanism significantly.

Pull the rope straight out. Avoid yanking it at an angle, which causes uneven wear on the rope and housing.
Use smooth, steady pulls. Jerking the rope puts stress on the knots and the engine’s recoil mechanism.
Keep the starter area clean. Regularly wipe away grass clippings, dirt, and debris from around the starter housing to prevent jamming.
Lubricate sparingly. If your starter has a metal center shaft, a single drop of light oil once a season can help. Avoid getting oil on the rope or inside the spring housing.
Store your mower properly. Keep it in a dry place to prevent rust and corrosion on the starter components.

FAQ Section

Here are answers to some frequently asked questions about lawn mower pull strings.

How Much Does It Cost To Fix A Lawn Mower Pull Cord?

The cost is very low if you do it yourself. A replacement rope costs around $5 to $10. A complete new starter assembly typically ranges from $15 to $30. A repair shop might charge $50 to $100 for labor.

Can You Start A Lawn Mower With A Broken Pull Cord?

In an emergency, you can sometimes start a mower by carefully wrapping the remaining rope around the pulley and pulling, but this is not safe or reliable. For a permenant solution, you should repair or replace the cord properly.

Why Does My Pull Cord Keep Breaking?

Frequent breakage can be caused by a frayed exit hole in the housing, a misaligned starter assembly, a damaged recoil spring creating too much tension, or simply using a poor-quality rope. Inspect all components when replacing the rope.

How Do You Wind A Recoil Spring On A Lawn Mower?

Carefully wind the spring coil into the housing in the direction of rotation, usually clockwise. Use a pair of pliers to hold the inner hook and turn the spring until it’s snug. Pre-winding the spring before installing the rope is key step that many people find challenging.

Is It Hard To Replace A Lawn Mower Starter Assembly?

No, it is one of the easier repairs. It usually involves removing just three or four bolts and swapping the old unit for a new one. The hardest part is often finding the correct model number to order the right part.

Fixing a lawn mower pull string is a very achievable DIY task. By following these steps, you can diagnose the problem, choose the right repair method, and get your mower back to working order. Remember to always prioritize safety by disconnecting the spark plug first. With a little effort, you’ll have that engine starting on the first pull again.