Ducati Superbike 999 Anleitung- Und Instandhaltungsheft Seite 181

Cleaning and replacing the spark plugs
Spark plugs are essential to smooth engine running and
should be checked at regular intervals. Spark plugs
condition provides a good measure of engine condition.
Have the spark plugs inspected or replaced at a Ducati
Dealer or Authorized Workshop. Firstly, they will check
the color of the ceramic insulator of the central electrode:
a light brown, even color is a sign of good engine
condition.
Secondly, they will check the central electrode for wear
E
and measure electrode gap. Electrode gap should be:
0.6-0.7 mm.
Important
An electrode gap outside the specified limit will
adversely affect engine performance and may lead to
difficult starting or erratic idling.
82
(fig. 78)
0,6 ÷ 0,7 mm
fig. 78