Spark Plug - APRILIA LEONARDO 250 Workshop Manual

PERIODIC MAINTENANCE
2.3.

SPARK PLUG

2.3.1. SPARK PLUG
Check the spark plug after the first 1,000 km (621 mi),
and then every 6,000 km (3,728 m). Change it every
1,2000 km (7,456 mi).
•
Check the spark plug regularly, remove carbon de-
posits and replace if necessary.
To reach the spark plugs:
DANGER
Allow the engine to cool down to ambient tem-
perature.
•
Remove right and left inspection covers, see 7.1.4
(REMOVING RIGHT AND LEFT INSPECTION
COVERS).
Removal and cleaning:
DANGER
Never remove a spark plug cap while the
engine is running. Shock hazard: the igni-
tion system produces high voltages.
•
Remove the cap (1) of the spark plug (2).
•
Remove any trace of dirt from the spark plug base.
•
Introduce the special spanner provided in the tool
kit on the spark plug (2).
•
Unscrew the spark plug (2) and extract it from its
seat, taking care to prevent dust or other sub-
stances from getting inside the cylinder.
•
Make sure that there are neither carbon deposits,
nor corrosion marks on the electrode and on the
spark plugs ceramics; if necessary, clean with a
plug cleaner or wire brush.
•
If the spark plug (2) insulating material is cracked, if
the electrodes are corroded, with excessive depos-
its or the tip of the central electrode (3) is rounded,
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 recommended spark plugs only. A
spark plug of the wrong grade may shorten
engine life and cause loss of performance.
To check the spark plug gap, use a wire
thickness gauge to avoid damaging the
platinum covering.
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