Spark Plug - APRILIA MX 125 Manual De Instrucciones

SPARK PLUG

Carefully read pag. 55 (MAINTENANCE).
Check spark plug wear at the end of the
running-in period, and then every 4,000
km. Change it every 8,000 km.
Periodically remove the spark plug and
cle a n it c are fu ll y , r e m o v i n g c a r b o n
deposits; change it if necessary.
To reach the spark plug:
Position the vehicle on the stand.
◆
CAUTION
Work on the right side of the vehicle.
use and maintenance MX 125
72
To remove and clean the spark plug:
Take off the spark plug cap (1).
◆
Remove all the dirt from the base of the
◆
spark plug, then unscrew it with the
spanner you will find in the tool kit and
extract it from its seat, taking care that
neither dust nor other substances enter
the cylinder.
Make sure that there are neither carbon
◆
deposits, nor corrosion marks on the
electrode and on the central porcelain
part; if necessary, clean them with the
special cleaners for spark plugs, with an
iron wire and/ or a metal brush.
Energetically blow some air, in order to
◆
prevent the removed residues from
getting into the engine.
If the spark plug has crackings on the
insulating material, corroded electrodes
or excessive deposits, it mu st be
changed.
Check the spark plug gap with a
◆
thickness gauge.
T h e g a p m u s t b e 0 . 5 ÷ 0 . 6 m m , i f
necessary adjust it, carefully bending the
earth electrode.
Make sure that the washer is in good
◆
conditions. With the washer on, screw
the spark plug by hand in order not to
damage the thread.
Tighten the spark plug by means of the
◆
spanner you will find in the tool kit, giving
it half a turn to compress the washer.
Spark plug driving torque:
20 Nm (2 kgm).
WARNING
The spark plug must be well tightened,
otherwise the engine may overheat and
be seriously damaged.
Use the recommended type of spark
plug only, see pag. 85 (TECHNICAL
DATA), in order not to compromise the
life and performance of the engine.
Position the spark plug cap (1) correctly,
◆
so that it does not come off due to the
engine vibrations.