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What is the general spark plug gap in mm?

1 Answers

DiSavannah

07/29/25 11:42am

The standard value for spark plug gap is 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 its insulator skirt and electrodes appearing gray-white, gray-yellow, or light brown. A properly functioning spark plug will have its insulator skirt showing a reddish-brown color, 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, with signs like blistering at the top, black streaks, cracks, or melted electrodes, the cause of the damage should be identified, and after troubleshooting, a new spark plug should be replaced. Additionally, if the spark plug appears black as if smoked, it indicates that the spark plug's heat range is incorrect or the mixture is too rich, with oil creeping up.

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