Which condition can negatively affect spark plugs?

Carbon-fouled spark plugs occur when carbon deposits build up on the spark plug's electrode and insulator due to incomplete combustion. This condition can reduce the spark plug's ability to generate a strong spark, which is critical for the proper ignition of the air-fuel mixture in the engine. When the spark is weak or inconsistent, it can lead to misfires, rough engine operation, and decreased overall engine performance. Frequent carbon fouling is often a sign of an engine running improperly, potentially due to incorrect fuel mixture, excessive idling, or poor ignition timing.

A properly functioning spark plug is crucial for maintaining engine efficiency and performance, while a carbon-fouled plug can lead to various issues, such as hard starting or reduced power. Therefore, recognizing and addressing carbon-fouled spark plugs is vital for effective small engine maintenance and operation.