MOTO GUZZI NEVADA User Manual page 59

2
Removal:
u Remove the spark plug cap (1).
u Remove any trace of dirt from the spark
plug base.
u Fit the special socket included in the tool
kit to the spark plug.
u Insert the spanner (2) with its handle -
i n c l u d e d i n t h e t o o l k i t - i n t o t h e
hexagonal flat of the spark plug socket.
u Unscrew the spark plug and extract it
from its seat, making sure no dust or dirt
fall into the cylinder.
Inspection and cleaning:
CAUTION
This vehicle is fitted with spark plugs with
platinum electrodes.
Do not clean the spark plugs with a wire
brush and/or abrasive products, use
compressed air only.
Key:
– centre electrode (3),
– insulator (4);
– side electrode (5).
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 (6) of the
central electrode (3) is rounded from wear.
7
CAUTION
Make sure the new spark plug has the
correct thread pitch and reach.
A thread reach which is too short will let
carbon build up in the spark plug hole
thread, leading to engine damage when
t h e r i g h t s p a r k p l u g i s r e f i t t e d
subsequently.
Use recommended spark plugs only,
see page 76 (TECHNICAL DATA). A
spark plug of the wrong rating may
shorten engine life and cause loss of
performance.
Electrode gap should be checked using
a wire gauge (7) to avoid damaging the
platinum coating.
use and maintenance Nevada
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