What are the symptoms of a faulty motorcycle spark plug?

1 Answers
LeIvan
07/30/25 12:37am
Motorcycle spark plug failure symptoms requiring replacement: difficulty starting, low power, excessive exhaust emissions, increased fuel consumption; severe spark plug damage with phenomena such as blistering at the top, black streaks, cracking, or electrode melting. Methods to determine if a spark plug is damaged: Remove the spark plug for observation and assess its condition based on the following appearance colors. A normal spark plug's insulator skirt and electrodes appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is contaminated with oil 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 blistering at the top, black streaks, cracking, electrode melting, etc., 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 the wrong heat range was selected or the air-fuel mixture is too rich, with oil seepage.
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