Spark Plug - APRILIA RALLY 50 - 2000 Manual

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Carefully read p. 41 (MAINTENANCE).
Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Check the spark plug after the first 500 km; change it
every 4000 km.
Periodically remove the spark plug and clean it care-
fully, removing carbon deposits; change it if neces-
sary.
To reach the spark plug:
Remove the inspection cover, see p. 56 (REMOV-
ING THE INSPECTION COVER).
60
Fig. 44
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 cylin-
der.
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 depos-
its, it must be changed.
Check the spark plug gap with a thickness gauge.
The gap must be 0,5
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 com-
press the washer.
0,6 mm; if necessary adjust