Ducati MONSTER S2R, Owner'S Manual

Page: 139 / 318

E
62
Cleaning and replacing the spark plugs
(fig. 59)
Spark plugs are an important part of the engine and should
be checked at regular intervals.
This is a relatively simple operation and provides a good
measure of engine condition.
Pull off the tubes from the plugs and remove them from
the cylinder head using the key in the toolkit.
Check the colour of the ceramic insulation on the centre
electrode: an even brown colour is a sign of good engine
condition.
If there is any other colour, or dark deposits, replace the
spark plug and describe the condition of the old plug to a
Ducati dealer or authorized workshop.
Also check the centre electrode; if it is worn or glazed,
replace the spark plug.
Check the electrode gap, which must be:
0.6-0.7 mm.
Important
Take care if bending the side electrode to adjust
the gap. A gap outside the specified limits will adversely
affect engine performance and may lead to difficult
starting or erratic idling.
Thoroughly clean the electrode and insulation using a
wire brush, and check the condition of the lining.
Clean the spark plug seat in the cylinder head, and take
care not to allow foreign objects to fall inside the
combustion chamber.
Re-insert the spark plug in the cylinder head and screw in
fully. Tighten to 20 Nm.
If you do not have a torque wrench, tighten by hand, then
give it a 1/2 turn with the key provided in the toolkit.
Important
Do not use spark plugs with an unsuitable heat
rating or incorrect thread length.
The spark plug must be tightened correctly.
0,6÷0,7 mm
fig. 59