Cleaning And Replacing The Spark Plugs - Ducati Monster 795 Owner's Manual

Cleaning and replacing the spark plugs

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
indication of how well the engine is running.
Pull the spark plug caps off the spark plugs and remove the
plugs from the cylinder heads using the wrench supplied in
the toolkit.
Check the colour of the ceramic insulation around the central
electrode: an even brown colour is a sign that the engine is
in good running order.
If the insulation is any other colour, or if there are dark
deposits, replace the spark plug and describe the condition
of the old plug to a Ducati dealer or Authorized Service
Centre.
Also check the central electrode; if it is worn or glazed,
replace the spark plug.
Check the distance between the electrodes, which must be:
0.7 - 0.8 mm.
Important
If adjustment is required, bend the side electrode
carefully. 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 gasket.
Carefully clean the seat in the cylinder head and be careful
not to let any foreign material fall into the combustion
chamber.
Insert the spark plug in the cylinder head and screw in fully
by hand. Tighten to a torque of 20 Nm.
If you do not have a torque wrench, after hand-tightening the
spark plug, turn it an additional half turn with the wrench
provided in the tool kit.
Important
Do not use spark plugs with an unsuitable heat rating
or incorrect reach.
The spark plug must be tightened correctly.
0,7÷0,8 mm
E
fig. 106
105