The pull cord is an important part of starting your lawn mower. It connects to the engine and allows you to start it up with a quick tug. Choosing the right size pull cord is essential for ease of starting and long term durability. In this article, we’ll look at how to determine what size pull cord you need for your specific lawn mower model. We’ll cover the different factors that go into proper pull cord sizing and provide recommendations on appropriate sizes for different mower types. Read on to learn what size pull cord is best for your lawn mowing needs!
Page Contents
What does the pull cord do?
The pull cord, also known as the starter rope, is connected to the starter mechanism on your lawn mower engine. When you tug on the cord, it causes the starter to spin the flywheel. This action builds compression in the engine which ignites the spark plug and starts the motor. Essentially, a quick and forceful pull on the cord provides the initial power to get the engine running.
Why size matters
The length and thickness of the pull cord affects how easy it is to start your mower. An improperly sized cord can lead to friction, getting caught in the housing, or even failing to engage the starter. A cord that is too short or thin will be difficult to grab and won’t have the strength to crank the engine over. On the other hand, one that is too long or thick may get jammed in the pulley housing when retracting. Using the optimal size provides smooth starting with minimal resistance or complications.
Measuring your pull cord
If you need to replace an old pull cord, the easiest way to identify the correct size is to measure the existing one. You’ll want to note two dimensions:
Length
Fully extend the cord and measure from end to end. This will give you the overall length. Standard lengths are between 36 and 48 inches long. Measure precisely, as even a few inches of difference can impact performance.
Thickness
Use a measuring tool like calipers to determine the diameter. Most pull cords range between 3 and 5 mm thick. Again, accuracy is important to find the matching thickness. Recording both the length and diameter will allow you to find an exact replacement cord.
Pull cord size by mower type
While measuring is most reliable, you can often estimate the appropriate pull cord size based on your lawn mower model. Here are some general sizing guidelines:
Walk-behind mowers
– Self-propelled: 36-40 inches long, 4-5 mm diameter
– Push mowers: 36-40 inches long, 3-4 mm diameter
The cords on walk-behind mowers need to be long enough to accommodate both hands, but short enough not to get tangled. Thicker cords are easier to grip on self-propelled models.
Riding mowers
– 42-48 inches long, 4-5 mm diameter
Riding mowers can utilize longer cords since you’re sitting atop the machine. The increased length allows for an easy two-handed pulling motion.
Zero-turn mowers
– 36-42 inches long, 4-5 mm diameter
Zero-turn mowers have a lever pull start, allowing a shorter cord to be effective. Focus on a diameter in the thicker range for an easy grip.
Material
Pull cords were traditionally made from braided rope. However, most modern replacement cords use a braided polyester blend or solid polymer wire. These synthetic materials are chosen for:
- Durability – Withstand repeated pulling without fraying or breaking.
- Weather-resistance – Won’t rot or degrade due to moisture and sun exposure.
- Flexibility – Has some give to avoid binding and tangling.
- Grip – Provides enough texture for hands to get good leverage.
Solid polymer cords tend to be the strongest while polyester blends offer more flexibility. Make sure any replacement matches the quality of your original.
Installation tips
Once you’ve selected the optimal replacement pull cord, you can install it with the following tips in mind:
- Anchor the new rope by tying a secure knot around the starter handle. This attaches it firmly to start cranking.
- Thread the cord through all the pulleys and guides. Avoid forcing through small openings to prevent fraying.
- Wind any excess rope around the rope guide leaving just 4-6 inches exposed.
- Tie a slip knot in the handle end of the rope to create a loop for easy grabbing.
- Test the installation by pulling the cord several times before reattaching covers.
Taking care during installation will ensure smooth operation and extend the life of your new pull cord.
Conclusion
Choosing the right pull cord for your lawn mower is dependant on several factors. Measuring your original cord is the best way to identify the ideal replacement size. If that’s not possible, use your mower type and starter type to estimate the proper length and thickness. Aim for a durable synthetic cord in the 36 to 48 inch range with a diameter between 3 and 5 mm. Careful installation helps prevent jamming and fraying. With the correct pull cord, starting your mower becomes a quick and easy process season after season.