Judging Spark Plug Condition by Color?

[StIan]

Methods for judging spark plug condition by color: A normal spark plug's insulator skirt and electrodes should appear grayish-white, grayish-yellow, or light brown. A properly functioning spark plug will have a reddish-brown insulator skirt. Methods for determining if a spark plug is damaged: Remove the spark plug and observe its condition based on the following color indicators. A normal spark plug's insulator skirt and electrodes should appear grayish-white, grayish-yellow, or light brown. A properly functioning spark plug will have a reddish-brown insulator skirt, with electrode gap between 0.8-0.9mm and no signs of electrode burning. If the spark plug has oil stains or deposits but isn't damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged with symptoms like blistering at the tip, black streaks, cracks, melted electrodes, etc., the cause of damage should be identified. After troubleshooting, replace with a new spark plug. Additionally, if the spark plug appears smoke-blackened, it indicates either incorrect heat range selection or rich fuel mixture, possibly with oil leakage.