Do Lawn Mower Spark Plugs Wear Out or Die?

Simples Fixes

• Sometimes when it appears that the spark plug has died or worn out, closer inspection may reveal that it is simply loose and needs to be tightened with a socket wrench. It is also possible that the spark plug wire has been disconnected and merely needs to be reattached for the lawn mower to work properly again.

Clogs

• The lawn mower's air and oil filters can become clogged with oil and debris, negatively affecting the spark plug's performance. Oil and gas residue can clog the spark plug and prevent the lawn mower from starting. However, you can clean the clogged spark plug with a wire brush.

Spark Plug Gap

• The spark plug has a gap where the spark is generated, and whenever this gap is not at the specified measurement, the spark plug won't work. Your lawn mower manual should list the correct gap distance, and you can purchase an inexpensive spark plug gap gauge to measure the gap. After determining the correct distance, the gauge can also be used to make gap adjustments.

Spark Plug Replacement

• The spark plug may have reached the end of its life cycle. If the oil and debris cannot be cleaned from it, or if it has sustained damage, replacement may be your best option. Yardener.com recommends replacing the spark plug every season since it is not a costly part, and since removal and installation are simple. Spark plugs can be purchased from hardware, automotive, lawn repair, home improvement and big box stores. However, all spark plugs are not the same, so you can either check the owner's manual for your correct type or take the spark plug with you.