2012 Ducati Diavel AMG Owners Manual - Page 203

Cleaning and replacing the spark plugs (fig. 173) Spark plugs are essential to smooth engine running and should be checked at regular intervals. The condition of the spark plugs provides a good indication of how well the engine is running. Have the spark plugs inspected or replaced at a Ducati Dealer or Authorized Service Center; they will check the color of the ceramic insulator of the central electrode (1): an even brown color is a sign that the engine is in good running order. 0,8 ÷ 0,1 mm (0.03 ÷ 0.004 in) 1 Note Inspect the center electrode for wear and check spark plug gap, which should be: 0.03-0.004 in (0.8-0.1 mm) fig. 173 Important A gap outside the specified limits will adversely affect engine performance and may lead to difficult starting or erratic idling. 202