What is the impact of spark plug gap size?

[MacCorbin]

If the gap is too small, the spark will be weak, which can easily lead to carbon buildup and potential spark plug leakage. If the gap is too large, a higher breakdown voltage is required, making the engine difficult to start and causing misfires during operation. The standard spark plug gap value 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 an insulator skirt and electrodes that appear grayish-white, grayish-yellow, or light brown. A properly functioning spark plug will have a reddish-brown insulator skirt, an electrode gap between 0.8-0.9mm, and no signs of electrode burn. If the spark plug is covered in oil or deposits but is otherwise undamaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, with 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.