Spark Plugs - APRILIA RS 125 Manual

RS 125
2.6.

SPARK PLUGS

2.6.1. SPARK PLUGS
TIGHTENING TORQUE SETTINGS
Spark plug tightening torque:
Check the spark plug after the first 1000 km (621 mi) and
then after 4000 km (2485 mi), change it every 8000 km
(4970 mi).
•
Periodically remove the spark plug and clean it carefully,
removing carbon deposits; change it if necessary.
To reach the spark plug, proceed as follows:
DANGER
Let the engine cool down until it reaches
room temperature.
•
Lift the fuel tank, see
For the removal and cleaning, proceed as follows:
DANGER
Do not disconnect the spark plug cap with the
engine running. The starting system could
generate a strong discharge.
•
Remove the spark plug (2) cap (1).
•
Remove any trace of dirt from the spark plug base.
•
Fit the special spanner provided in the tool kit on the
spark plug.
•
Unscrew the spark plug and extract it from its seat,
taking care to prevent dust or other substances from
getting inside the cylinder.
•
Make sure that there are neither carbon deposits, nor
corrosion marks on the electrodes and on the
insulating material; if necessary, clean them with the
special spark plugs cleaners and/or a metal brush.
•
If the spark plug has crackings on the insulating
material, corroded electrodes, excessive deposits on
the rounded tip of the central electrode (3), it must be
changed.
WARNING
When changing the spark plug, check the
thread pitch and length.
If the threaded part is too short, the carbon
deposits will accumulate on the thread seat,
and therefore the engine may be damaged
during the installation of the right spark plug.
Use the recommended type of spark plugs
only, in order not to compromise the life and
performance of the engine.
To check the spark plug gap, use a wire feeler
gauge to avoid damaging the platinum
covering.
•
Check the spark plug gap with a wire feeler gauge.
•
The gap must be 0.6 - 0.7 mm. If not, adjust it by
bending the earth electrode with extreme care.
•
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.
20 Nm (2.0 kgm).
2.9.1.
ROUTINE MAINTENANCE
0,7 - 0,8 mm
3
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