Spark Plug - APRILIA SR 50 Manual Del Usuario

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SPARK PLUG

Carefully read p. 44 (MAINTENANCE).
Check the spark plug after the first 500 km
(312 mi), and successively every 5000 km
(3100 mi) or 12 months.
Periodically remove the spark plug and clean
it carefully, removing carbon deposits;
change it if necessary.
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To remove and clean the spark plug:
WARNING
Before carrying out the following
operations, let the engine and the exhaust
silencer cool down until they reach room
temperature, in order to avoid burns.
◆
Take off the battery compartment
cover.
◆ 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 must be changed.
◆ Check the spark plug gap with a feeler
gauge. The gap must be 0.6 - 0.7 mm,
0.9 mm; if 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 (2.0 kgm).
CAUTION
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 p. 79 (TECHNICAL DATA), in order
not to compromise the life and performance
of the engine.
◆ Position the spark plug cap (1).
◆ Refit the inspection cover.
use and maintenance SR 50 65