87
use and maintenance Griso R
Inspection and cleaning:
CAUTION
Do not clean the spark plugs with a wire
brush and/or abrasive products, use
compressed air only.
Key:
– center electrode (7);
– insulator (8);
– side electrode (9).
u Check electrodes and insulator for
carbon deposits or traces of corrosion
and blow them with compressed air if
needed.
Always change a spark plug which has a
cracked insulator, corroded electrodes,
excessive deposits or when the tip (10) of
the central electrode (7) is rounded from
wear.
CAUTION
Only use recommended spark plugs,
see page 103 (TECHNICAL DATA) or the
engine performance and life-span might
be impaired.
Electrode gap should be checked using
a wire gauge (11) to avoid damaging the
platinum coating.
u Check electrode gap with a wire gauge
(11).
CAUTION
Never attempt to adjust electrode gap.
Electrode gap should be 0.6 - 0.7 mm. If
not so, change the spark plug.
u Make sure that the washer (12) is in
good condition.
Installation:
u Position the washer (12) and screw in
the spark plug by hand in order not to
damage the thread.
u Tighten each spark plug by one half of a
turn to compress the washer using the
socket included in the tool kit.
Spark plug tightening torque: 20 Nm (2
kgm).
CAUTION
The spark plug must be tightened
firmly, otherwise the engine may
overheat and severe damage may
occur.
u Position the spark plug cap properly to
prevent it coming off due to engine
vibration.
NOTE Repeat the above procedure for
the spark plug of the other cylinder.
7
9
8
10
12
11
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