What Causes a Motorcycle Spark Plug to Be Wet and Black?

1 Answers
VanGenevieve
07/29/25 7:36pm
Motorcycle spark plugs becoming wet and black may be due to an overly rich fuel-air mixture, excessively high oil level, spark plug misfiring, leakage, abnormal ignition by the igniter, or mechanical faults. 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’s insulator skirt and electrodes should appear gray-white, gray-yellow, or light brown. If the spark plug has oil stains or deposits, the spark plug itself is not damaged. If the spark plug tip shows signs of blistering or black streaks.
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