Why is there engine oil inside a motorcycle spark plug?
1 Answers
Motorcycle spark plugs containing engine oil may be caused by an overly rich fuel mixture, excessively high oil level, spark plug misfiring, leakage, abnormal ignition from the ignition system, or mechanical component failures. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its appearance color to assess its condition. 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. Phenomena such as blistering or black streaks appearing at the top of the spark plug.