Common spark plug problems for lawn mowers can cause a variety of problems, including difficult starting, erratic operation, and reduced performance.
Spark plug carbon deposits: The engine may be difficult to start, run poorly, or even stall.
Troubleshooting: Check the spark plug gap with a gap gauge or gauge plate and adjust to the manufacturer's specifications.
Spark plug overheating: Overheating may cause electrode wear and spark plug failure.
Troubleshooting: Make sure the spark plugs used have the appropriate heat range. Installing spark plugs with the wrong heat range may cause overheating. If necessary, replace the spark plug with one that has the proper heat range.
Carbon deposits on the spark plug: Black soot deposits on the spark plug may cause erratic engine operation.
Troubleshooting: Clean the carbon deposits on the spark plug electrodes and porcelain bottles. Use a suitable cleaner, such as spark plug cleaner, to clean the spark plug.
Cracked spark plug insulator: Damaged insulators may cause leakage and poor ignition.
Troubleshooting: Check the spark plug insulator for cracks or damage. If you find any problems with the insulator, replace the spark plug.
