As a gardening and landscaping expert, I understand how frustrating it can be when your lawn mower won’t start. One of the first things to check in such a situation is the spark plug. The spark plug plays a crucial role in igniting the fuel in the engine, so if it is dirty or fouled, it can prevent the mower from starting.
To examine the spark plug, you will need a spark plug wrench or socket wrench, depending on the type of spark plug your mower uses. Start by locating the spark plug, which is usually situated on the side or top of the engine. Once you locate it, use the wrench to gently loosen and remove the spark plug.
Now, take a close look at the spark plug. If it appears dirty, covered in grime, or has a black, sooty residue, it is likely fouled. This can happen due to a variety of reasons, such as an overly rich fuel mixture, oil leakage into the combustion chamber, or simply normal wear and tear.
If the spark plug is dirty, it is essential to clean it before deciding whether it needs to be replaced. Using a wire brush or spark plug cleaner, scrub the electrode and insulator to remove any dirt or carbon deposits. Make sure to clean both the electrode (the metal part) and the insulator (the ceramic part).
After cleaning the spark plug, check the electrode gap. This refers to the distance between the center and side electrode. You can use a spark plug gap tool or a feeler gauge to measure the gap. Consult your lawn mower’s manual or the manufacturer’s specifications to determine the correct gap size. Use the tool to adjust the gap if necessary.
Once the spark plug is clean and the gap is properly set, carefully reinstall it into the engine. Make sure to tighten it securely, but be cautious not to overtighten and damage the threads.
If after cleaning the spark plug and reinstalling it, the engine still doesn’t start, it may be time to consider replacing the spark plug. Spark plugs are relatively inexpensive, and a new one can often solve the starting issue. Consult your lawn mower’s manual or the manufacturer’s recommendations to determine the specific type of spark plug required.
A dirty or fouled spark plug can be a common cause of a lawn mower not starting. By examining the spark plug, cleaning it if necessary, and ensuring the proper electrode gap, you can troubleshoot and potentially resolve the issue. If all else fails, replacing the spark plug is a simple and cost-effective solution that may get your small engine up and running again.
