What is the general electrode gap for spark plugs?

1 Answers
MollyRose
07/30/25 2:35am
Spark plug electrode gaps are generally between 0.8-0.9mm. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its condition based on the following appearance colors. A normal spark plug will have a skirt insulator and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug will have a skirt insulator that is reddish-brown, with an electrode gap between 0.8-0.9mm and no signs of electrode burning. If the spark plug has oil stains or deposits but is not damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, showing signs such as blistering at the top, black streaks, cracks, or melted electrodes, the cause of the damage should be identified. After troubleshooting, replace the spark plug with a new one. Additionally, if the spark plug appears black as if smoked, it indicates that the wrong heat range was selected or the air-fuel mixture is too rich, with oil creeping up.
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