How Do You Change a Pull String on a Lawn Mower? (Step-by-Step Guide)

Direct Answer: How to Change a Pull String on a Lawn Mower

To change a pull string on a lawn mower, remove the starter housing by unbolting it from the engine, detach the old recoil cord from the pulley, thread a new replacement cord through the recoil mechanism, wind it tightly around the pulley, and reassemble the housing. The exact procedure varies by mower type—gas-powered models typically require full disassembly, while some electric mowers have simplified designs allowing cord-only replacement without removing the housing.

Understanding Your Mower’s Recoil Starter System

Before attempting a pull string replacement, it’s important to understand how recoil starters function. A recoil starter consists of several key components working together:

• Recoil spring: A tightly wound metal spring that provides the force to retract the cord automatically after you release it
• Pulley: The spool around which the pull string wraps, connected to the spring
• Pull cord: The rope you grip and pull to crank the engine
• Starter housing: The protective plastic or metal casing that contains all recoil components
• Handle: The grip attached to the end of the pull cord

Gas-powered mowers rely entirely on the recoil starter mechanism since they have no electric starter motor. When you pull the cord, the pulley rotates and engages with the engine’s crankshaft, turning it over to start combustion.

Electric corded mowers typically have a button-activated electric motor, so they may not have a recoil starter at all. Battery-powered mowers similarly use electric starters, though some older models or backup systems include a pull cord.

When deciding whether to repair or replace your pull string, consider these factors: a frayed or partially broken cord may be repairable by re-gripping or tying a knot, but a completely severed cord or non-retracting mechanism requires full replacement. If the recoil spring itself is damaged or the pulley is cracked, you may need to replace the entire starter assembly rather than just the cord.

Tools and Materials You’ll Need

Gathering the right supplies before starting prevents frustration and ensures a successful repair. Here’s what you should have on hand:

Important Safety Precaution: Before beginning any work on your lawn mower’s starter, disconnect the spark plug wire to prevent accidental engine starting. This single step prevents serious injury from an unexpected engine rotation while you’re working on the recoil mechanism.

Purchase replacement cord from your mower’s manufacturer or from hardware stores specializing in outdoor power equipment. Avoid using regular rope or twine—pull string cord is specially rated for repeated tension and flexing. A typical gas-powered lawn mower requires 2-3 meters of replacement cord in 3-4mm diameter.

How to Replace a Pull String on a Gas-Powered Lawn Mower

Gas-powered lawn mowers represent the most common scenario for pull string replacement. Follow this step-by-step procedure:

Step 1: Access the Starter Housing

Locate the recoil starter assembly on your engine—it’s typically a plastic or metal housing on the side of the engine block. Note the position and number of bolts holding it in place. Use your marker to draw a quick diagram showing bolt locations, as this helps during reassembly. Remove all bolts using your socket wrench or adjustable wrench, working from the outside toward the center to avoid stress on the housing. Gently wiggle the housing as you remove the final bolts to prevent it from falling.

Step 2: Inspect the Recoil Spring and Pulley

Once the housing is removed, examine the spring and pulley for damage. Look for rust, cracks in the plastic pulley, or a spring that’s visibly broken or has lost tension. If the spring is damaged, you’ll need to replace the entire recoil assembly rather than just the cord. If everything looks intact, proceed with cord replacement.

Step 3: Remove the Old Cord

Examine how the old cord is attached to the pulley. Most mowers use either a knot tied through a hole in the pulley or a crimped attachment point. If knotted, you can simply cut the old cord away. If crimped, carefully pry or cut away the crimp attachment. Be cautious not to damage the pulley itself. Remove any frayed cord fragments and clean the pulley with a small brush or compressed air.

Step 4: Release Spring Tension (If Needed)

Some recoil starters have a spring that’s pre-tensioned and dangerous to handle. If you see the spring is wound tightly, you may need to carefully release tension by slowly rotating the pulley counterclockwise until the spring relaxes. Work slowly and wear gloves—a suddenly released spring can cause injury. If you’re uncomfortable with this step, consider consulting your mower’s manual or seeking professional help.

Step 5: Thread the New Cord

Cut your replacement cord to the appropriate length (consult your mower’s manual for exact specifications, typically 2-3 meters). Slightly melt or seal the cut ends of synthetic cord with a lighter to prevent fraying. Thread one end of the new cord through the hole in the pulley, leaving about 6-8 inches of cord extending outward. Tie a secure knot to attach it—use a figure-eight knot or double overhand knot to prevent slipping. Some users prefer to melt the cord end slightly to lock it in place, but knotting is more reliable and reversible.

Step 6: Wind the Cord Around the Pulley

This is the critical step that determines whether your pull string will work smoothly. Hold the pulley steady and wind the cord around it in the direction of pulley rotation (typically counterclockwise when viewed from the front). Use firm, even tension as you wind, keeping loops tight against each other without overlapping. Most mowers require 3-4 complete wraps around the pulley. Wind slowly and deliberately—rushing this step causes tangles and poor retraction.

Step 7: Attach the Handle

Once wound, thread the remaining cord end through your new handle grip (or reuse the old handle if it’s still in good condition). Tie another secure figure-eight knot to prevent the handle from slipping off. Leave about 2-3 inches of cord inside the handle for the knot. Test that the handle is firmly attached and won’t rotate or slip under tension.

Step 8: Test Cord Retraction

Before reassembling, test whether the cord retracts smoothly. Pull gently on the handle—the cord should extend smoothly and retract quickly when released. If it catches or doesn’t retract, you may have wound it incorrectly or the spring needs attention. Don’t force it; stop and rewind if necessary.

Pull String Replacement for Electric and Battery-Powered Mowers

Most electric and battery-powered mowers use electric starter motors rather than recoil starters, so they don’t have pull strings. However, some older hybrid models or backup systems may include a pull cord.

If your electric mower does have a recoil starter, the procedure is similar to gas mowers but often simpler due to less space constraints and lighter-duty components. The main difference is that electric mowers typically use thinner, lighter cord since the recoil starter is a backup system rather than the primary starting mechanism. Follow the same steps outlined for gas mowers, but expect faster retraction and lighter pulling resistance.

If your electric mower won’t start and you suspect a pull cord issue, check first whether the machine has a battery or power outlet connection. Most electric starting failures result from battery discharge or power cord issues, not starter problems. Consult your mower’s manual to identify whether a recoil starter is actually present before attempting this repair.

Reassembling the Starter Housing

Proper reassembly is just as important as the replacement process. Follow these steps:

• Position the housing: Align the starter housing over the engine, ensuring the pulley and spring remain in their correct positions within the casing
• Insert bolts: Replace bolts in reverse order from how you removed them (center outward), and use your marked diagram to ensure correct positioning
• Tighten gradually: Tighten bolts in a crisscross pattern rather than going around in a circle—this distributes pressure evenly and prevents warping
• Final test: Before starting the engine, pull the cord several times to confirm smooth operation and quick retraction
• Reconnect spark plug: Once satisfied with cord operation, reattach the spark plug wire

If the cord feels unusually stiff or won’t retract after reassembly, the housing may be misaligned or the spring may need tension adjustment. Do not force the cord or attempt to start the engine—stop and review your work first.

Troubleshooting Common Pull String Problems

Cord Won’t Retract Fully

If your newly replaced cord stays partially extended instead of snapping back, the recoil spring has likely lost tension or the pulley isn’t turning freely. Check that the spring is properly positioned and not bent. Apply a small amount of lubricating oil around the pulley bearing to reduce friction. If the problem persists, the spring may need replacement.

Pull String Feels Too Hard

Excessive tension makes starting difficult and can be dangerous. This usually indicates over-winding of the cord on the pulley or excessive spring tension. Remove the housing and unwind one complete loop from the pulley, retesting afterward. If tension is still high, the spring may be over-tensioned and require professional adjustment.

New Cord Breaks Quickly

Premature cord failure suggests you’re using incorrect cord material or the pulley has sharp edges that fray the rope. Verify you’re using proper pull string cord rated for the application. Examine the pulley for cracks or sharp points—sand down rough edges if necessary. Ensure knots are properly tied and that cord doesn’t twist as it winds.

Starter Won’t Engage with Engine

If the engine doesn’t turn when you pull the cord, the pulley may not be properly meshing with the engine’s crankshaft. Remove the housing and visually confirm that the pulley is fully seated and aligned. Check that the pawl (the mechanism that engages with the crankshaft) moves freely and isn’t stuck or broken. If damaged, the entire recoil assembly requires replacement.

When to Seek Professional Help

While pull string replacement is achievable for many homeowners, certain situations warrant professional repair:

• Damaged recoil spring: If the spring is broken, rusted, or has lost tension completely, you’ll likely need a complete starter assembly replacement rather than just cord replacement
• Cracked pulley: Plastic pulleys that are cracked or broken cannot be reliably repaired and require replacement
• Stuck pulley: If the pulley won’t turn at all due to corrosion or seized bearings, mechanical work beyond cord replacement is necessary
• Warranty concerns: Some mower warranties are voided by owner repairs—check your documentation before proceeding
• Unfamiliarity with mechanics: If you’re uncomfortable working with small engine components or handling spring tension, professional service is safer and faster

Professional repair typically costs $75-$150 depending on mower make and whether just the cord or the entire assembly is replaced. DIY replacement costs $15-$30 in materials, making it economical if you’re confident in your mechanical skills.

Frequently Asked Questions

How often should I replace my lawn mower’s pull string?

With normal use and proper storage, a pull string should last 3-5 years or longer. However, if you pull hard, store the mower outside in harsh weather, or don’t protect the cord from UV damage, replacement may be needed every 1-2 years. Replace the cord immediately if it frays, breaks, or stops retracting smoothly rather than waiting for complete failure.

Can I use regular rope or paracord instead of pull string cord?

No. Regular rope and paracord are not rated for the repeated high-tension cycles that a recoil starter experiences. They will fray, stretch, and fail much faster than proper pull string cord designed for this application. Always use manufacturer-approved replacement cord available from mower dealers or outdoor power equipment suppliers.

What should I do if the recoil spring breaks while I’m working on it?

Stop immediately and do not attempt to continue. A broken spring is dangerous—do not try to replace it yourself unless you have mechanical experience with springs. The spring stores significant energy, and improper handling can cause injury. Take the mower to a professional for spring replacement or complete recoil assembly replacement.

Is it normal for a new pull string to feel slightly different than the original?

Yes, slightly different tension or feel is normal and expected. If you’ve adjusted the spring tension, used slightly different cord diameter, or wound the cord differently than the factory did, the pull sensation will change. The cord should still operate smoothly and retract quickly—this is what matters. If it feels excessively stiff or loose, rewind or adjust accordingly.