Spark Plug - APRILIA LEONARDO 125 - 2006 Manual

Leonardo125-300_UK.book Page 56 Tuesday, January 20, 2004 3:54 PM
300

SPARK PLUG

Carefully read p. 39 (MAINTENANCE).
Check the spark plug after the first 1000
km (625 mi) and successively every 6000
km (3750 mi).
! "
Change the spark plug every 6000
km (3750 mi).
#
Change the spark plug every
300
12000 km (7500 mi).
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:
Remove the left inspection cover (
right inspection cover), see p. 52
300
(REMOVING THE RIGHT AND LEFT
INSPECTION COVERS).
56 use and maintenance Leonardo 125 - 150 - 250 - 300
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 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 thickness
gauge.
The 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
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:
18 Nm (1,8 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. 68 (TECHNICAL DATA), in
order not to compromise the life and
performance of the engine.
Position the spark plug cap properly, so that
it does not come off due to the vibrations of
the engine.
#
Put back the left inspection cover (
right inspection cover), see p. 52
(REMOVING THE RIGHT AND LEFT
INSPECTION COVERS).
300