Spark Plug - APRILIA Mojito 50 Workshop Manual

50 CC VERSION
2.2.4.

SPARK PLUG

THIGHTENING TORQUE
Spark plug:
Check the spark plug after the first 500 km (312 mi) and suc-
cessively every 4000 km (2500 mi). Change it every 8000
km (5000 mi).
•
Periodically remove the spark plug, clean any carbon
deposits from it; change it if necessary.
To reach the spark plug:
DANGER
Let the engine cool down to ambient tempera-
ture.
•
Remove the central inspection cover.
To remove and clean the spark plug:
DANGER
Never disconnect the spark plug cap when the
engine is running as you may suffer a severe
electric shock from the ignition system.
•
Take off the cap (1) from the spark plug (2).
•
Remove all the dirt from the base of the spark plug.
•
Put the plug spanner supplied in the tool kit over the
spark plug.
•
Unscrew the spark plug and remove it from its seating,
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, and/or a metal brush.
•
If the spark plug has any crackings on the insulating
material, corroded electrodes or excessive deposits,
the central electrode (3) with a rounded top, it must be
changed.
WARNING
When replacing the spark plug check the pitch
and length of the thread.
If the thread is too short the carbon deposits
will build up on the thread, resulting in a risk of
damaging the engine when a spark plug of the
correct size is fitted.
Use the recommend type of spark plug only,
otherwise the life and the performance of the
engine may be compromised.
To check the gap between the electrodes, use a
thread type feeler gauge to avoid damaging the
platinum coating.
•
Check the gap between the electrodes using a thread
type feeler gauge.
•
This gap must be 0.6 – 0.7 mm. If necessary, adjust it
carefully bending the earth electrode.
•
Make sure that the washer is in good condition. 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 sup-
plied with the tool kit, giving it a half turn to compress
the washer.
2 - 12
20 Nm (2 kgm).
MOJITO 50 - 125 - 150