The Pull Cord Replacement Process
A broken or frayed pull cord stops your lawn mower cold, but replacing it is a job you can do yourself in about half an hour with basic tools. The cord winds around a spring-loaded spool inside the engine housing called the recoil starter. When the cord snaps or becomes too short to grip, you unwind the old cord, wind the new one around the spool in the same direction, and thread it back through the handle.
You do not need special skills or equipment—just a new cord (usually nylon, sold in hardware stores), a pair of scissors, a screwdriver, and a lighter or match to seal the cut ends so they do not fray. The hardest part is keeping tension on the spring while you work, but the steps below show you how to do that safely.
Key Takeaways
- Buy a replacement cord that matches your mower's original diameter—usually 3/16 inch or 1/4 inch—and bring your old cord to the store if you are unsure.
- Remove the recoil starter housing by unbolting it from the engine, then unwind the old cord and note which direction it wraps around the spool.
- Wind the new cord in the same direction as the old one, keeping steady tension on the spring so it does not unwind and snap back at your hand.
- Seal both cut ends of the new cord with a lighter to prevent fraying, then test the pull before reassembling the housing.
- If the cord does not rewind smoothly or the handle sticks, the spring may need re-tensioning—a step that requires care but is part of the same job.
What You Need Before You Start
Gather your materials on a flat work surface before you open the mower. You will need a replacement pull cord (nylon, 3/16 inch or 1/4 inch diameter—check your old cord or the mower manual), a screwdriver that fits your mower's bolts (usually Phillips or flathead), scissors, a lighter or matches, and a small container or bag to hold the bolts you remove so they do not roll away.
Wear work gloves when handling the recoil starter spring, because it is under tension and can pinch or cut your fingers. If your mower has a fuel tank, drain it or work outdoors in case any spills. Disconnect the spark plug wire from the spark plug by twisting and pulling it off—this prevents the engine from starting accidentally while you work.
Removing the Recoil Starter Housing
Locate the recoil starter on top of the engine. It is a round or oval plastic or metal housing with the pull cord handle attached. Look for bolts around the edge of the housing where it bolts to the engine block. Most mowers have three to five bolts; remove each one with your screwdriver and place them in your container.
Lift the housing straight up and away from the engine. You will see the spool inside, wrapped with the old cord, and a metal spring coiled around it. Set the housing on your work surface with the spool facing up. Do not let the spring unwind—if it does, it will snap back hard and can injure your hand. If the spring is already loose, wrap a rubber band or cloth around the spool to hold it in place temporarily.
Unwinding the Old Cord and Preparing the Spool
Look at how the old cord wraps around the spool. Most mowers wrap clockwise when you look down at the spool from above, but yours may be different. Note the direction before you remove anything. Gently unwind the old cord by turning the spool by hand in the direction opposite to how the cord was wound. Keep one hand on the spring to prevent it from unwinding.
Once the cord is completely unwound, pull it out of the handle hole and discard it. Inspect the spool for cracks or damage. If the spool is cracked, the cord will slip and you will need a new recoil starter assembly. If the spool is sound, wipe away any dirt or old cord fibers with a dry cloth. Check that the spring is still coiled tightly. If it has loosened, you will need to re-tension it before installing the new cord—see the section on spring re-tensioning below.
Installing and Winding the New Cord
Cut a length of new cord about 12 to 18 inches longer than your old cord was. Seal both cut ends by holding them briefly in a lighter flame or passing them quickly through a match flame until the nylon melts slightly and hardens. This prevents the cord from unraveling. Let the ends cool for a few seconds before touching them.
Thread one end of the new cord through the hole in the spool from the inside, then through the handle hole in the housing. Pull the cord taut so there is no slack. Now wind the cord around the spool in the same direction as the old cord wrapped, keeping steady tension with your other hand so the cord lies flat and does not overlap itself. Wind until the spool is nearly full—leave about 1/4 inch of space so the cord does not jam. The handle should now be at the end of the cord, ready to pull.
Re-tensioning the Spring (If Needed)
Before you reassemble the housing, test the recoil by pulling the cord slowly. It should pull smoothly and rewind on its own when you release it. If the cord does not rewind or rewinds very slowly, the spring needs more tension. This happens when the spring has loosened during storage or removal.
To re-tension, hold the spool steady with one hand and turn it clockwise (the direction opposite to cord unwinding) about two full rotations. This winds the spring tighter. Pull the cord again to test. Repeat this process—two rotations at a time—until the cord rewinds with a snappy feel. Do not over-tension; if the cord becomes hard to pull or the spring feels like it might snap, you have gone too far. Back off by turning the spool counterclockwise a half rotation.
Reassembling and Testing
Once the cord pulls and rewinds smoothly, you are ready to bolt the housing back onto the engine. Align the housing with the bolt holes on the engine block and insert each bolt by hand first to make sure they thread straight. Then tighten them with your screwdriver in a crisscross pattern (like tightening a car wheel) so the housing sits evenly. Do not over-tighten; snug is enough.
Reconnect the spark plug wire by pushing it firmly onto the spark plug until it clicks or seats fully. Pull the cord a few times to make sure it moves freely and the engine does not turn over (the spark plug wire disconnected prevents starting). If the cord sticks or feels rough, stop and check that the housing bolts are tight and the cord is not pinched between the housing and engine.
Common Mistakes to Avoid
The most common error is winding the cord in the wrong direction. If you wind it opposite to how the original wrapped, the cord will not rewind properly and may tangle. Always note the direction before you remove the old cord. Another mistake is cutting the new cord too short. Buy a cord that is at least as long as the old one, and preferably a few inches longer so you have room to adjust the handle position if needed.
Do not let the spring unwind while you work. If it does, it will snap back and can break bones or cause deep cuts. Keep one hand on the spool at all times, and if you need both hands free, wrap a rubber band or cloth around the spool to hold the spring in place. Finally, do not seal the cord ends with a knife or by melting them in a flame for too long—a quick pass is enough. Over-melting weakens the cord and can make it brittle.
Frequently Asked Questions
What size pull cord do I need?
Most lawn mowers use either 3/16 inch or 1/4 inch diameter nylon cord. Bring your old cord to a hardware store and compare it to the spools on the shelf, or check your mower's manual. If you buy the wrong size, it will either be too loose on the spool or too thick to fit through the handle hole.
Can I use a different type of rope instead of nylon?
No. Nylon is the standard because it resists fraying, does not absorb water, and has the right amount of stretch. Cotton or hemp rope will rot, absorb moisture, and fray quickly. Stick with nylon cord sold for this purpose.
What if the cord still does not rewind after I install it?
The spring may need more tension, or the spool may be damaged. Try re-tensioning the spring by turning the spool clockwise two rotations at a time and testing the pull. If the cord still does not rewind smoothly, the spool or spring may be cracked or worn out, and you will need a new recoil starter assembly.
How tight should the cord be wound?
Wind the cord snugly so it lies flat and does not overlap itself, but not so tight that it is hard to pull. The cord should wrap around the spool in neat, parallel loops with no gaps or bunching. If you have to strain to pull the cord, the spring needs less tension, not more.
Do I need to drain the fuel tank before I start?
It is not strictly necessary, but it is safer. If you spill fuel while removing the housing, it could ignite near the spark or a hot engine. If your tank is full, drain it into a safe container or work outdoors away from ignition sources. At minimum, disconnect the spark plug wire before you begin.