Bad mower spark plug

The job of a spark plug is to ignite the fuel and air mixture that the carburetor sends to an engine cylinder.

Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time. Fortunately, the spark plug is one of the easiest engine components to replace. This step-by-step guide will teach you how to tell if a lawn mower spark plug is bad along with tips for testing other garden equipment. The ignition process relies on a suitable balance of fuel and air being drawn through the carburetor into the engine, a properly operating ignition coil , and a functioning spark plug. The flywheel has permanent magnets built into it, and as it moves past the ignition coil a magnetic field is created which induces electricity, allowing the ignition coil to send a high-voltage pulse to the spark plug.

Bad mower spark plug

The electrodes on a spark plug must be clean and sharp to produce the powerful spark required for ignition. The more worn or dirty spark plugs are, the greater the pull on the rewind and more effort is required to produce an adequate spark. These problems may also cause excessive fuel consumption, deposits on the cylinder head and oil dilution. Luckily, spark plugs are one of the easiest and most inexpensive engine components to replace. To check if your spark plug has gone bad you'll need to inspect your part for common signs suggestive that it might be fouled or damaged. Check out the steps below which outline how to determine why your spark plug is no longer working correctly. Review the FAQ on troubleshooting ignition system problems to learn how a spark tester can identify problems with the ignition coil, switch, flywheel or other small engine parts. To safely clean a spark plug, you should use a wire brush or spray-on plug cleaner specifically designed for this ignition part. This is one of the easiest steps in lawn mower or small engine maintenance. Still have questions? WARNING: Always read the engine and equipment manual s before starting, operating, or servicing your engine or equipment to avoid personal injury or property damage. See an authorized dealer if you are unsure of any procedure or have additional questions. Find all Engine Safety Warnings.

Register Product. Lawn Mower Maintenance. Changing Spark Plugs.

Thriving Yard is an affiliate for companies including Amazon Associates and earns a commission on qualifying purchases. Sometimes identifying if it actually is the spark plug that is the problem can be a challenge. Read on to see what makes a spark plug go bad, how to tell if yours has reached the end of its life, how to reinstall one, and when it needs replacing. Lawnmowers can have a variety of problems, and it can sometimes be difficult to diagnose which part is to blame. There are some key things to watch for that will let you know that the spark plug is the culprit.

Knowing how to test a spark plug on a lawn mower is something that can really come in handy. The best part is, once you know how to test one spark plug, you know how to test them all. The main signs that potentially indicate a bad lawn mower spark plug are:. In order to give your spark plug a quick examination, you will need a couple of tools. Let me go through a very broad description of how to test a spark plug on a lawn mower before I dive into detail. The process of removing a lawn mower spark plug is pretty straightforward with the right tools. Pop the spark plug hood off, secure the ignition cable away from the plug, and get your socket set on it. To conduct a test for spark without a multimeter, I would recommend asking a friend or neighbor to lend a hand.

Bad mower spark plug

If you have spent any length of time using a gas-powered lawn mower, you may have come across the problem of a bad spark plug. A spark is needed for the internal combustion engine to run, and a spark plug is essential to the function of your lawn mower. But luckily for you, there are a number of pretty obvious ways to tell a lawn mower has a bad spark plug. If your lawn mower will not start at all, no matter how many times you pull the cord or turn the ignition, this could be an indication that the spark plug is bad.

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Integrated Systems Batteries Battery Storage. The air is warmer and the grass is growing — time to break out the lawn mower. Integrated Systems. Find all Engine Safety Warnings. Find My Part. Spark plugs are not one of those parts, unfortunately. Check the air filter The job of the air filter is to remove dirt and debris from the air before it enters your engine. In this case, the spark created by the spark plug is too weak to ignite the fuel and air mixture in the cylinder. Attempt to start the engine but stand clear of the tester or any other electrical component to avoid a shock. Fortunately, the spark plug is one of the easiest engine components to replace. The ignition process relies on a suitable balance of fuel and air being drawn through the carburetor into the engine, a properly operating ignition coil , and a functioning spark plug. Luckily, spark plugs are one of the easiest and most inexpensive engine components to replace. This skill comes in handy not only for diagnosing your lawnmower, but also your other small-engine equipment like weedeaters and leaf blowers.

From this guide, you will learn How to tell if a lawn mower spark plug is bad. This guide will quickly help you find and remove your spark plug and use five 5 simple steps to determine whether your lawn mower spark plug is bad.

If it appears dark black, change it. Unfortunately, after months of sitting around, it is likely your lawn mower may not run smoothly, or even start at all. Find a Dealer Find a Distributor. If the filter is dirty, it should be replaced. How does the spark plug work? Integrated Systems. Find all Engine Safety Warnings. Typically, the consensus among the mechanical engineer community is that a spark plug for a lawn mower will last up to 25 hours of use. Engine Parts. If the spark plug is in good shape but the electrode end is black with carbon, you can clean it with a wire brush. Skip Navigation Home.