APRILIA MXV 450 - Page 28

KEY:
central electrode (3);
insulator (4);
side electrode (5).
•
Check that the electrodes and the in-
sulator of the spark plug (2) do not
show signs of carbon deposits and cor-
rosion. If necessary, clean them using
a compressed air jet.
Replace the spark (2) if its insulator is cracked, the
electrodes show signs of corrosion or excessive
deposits, or the top of the central electrode gets
rounded (6).
CAUTION
WHEN REPLACING THE SPARK PLUG (2), CHECK THE
PITCH AND LENGTH OF THE THREAD. IF THE THREADED
PART IS TOO SHORT, CARBON DEPOSITS WILL BUILD
UP ON THE THREAD'S SEAT AND MAY THUS CAUSE
DAMAGE TO THE ENGINE WHEN THE CORRECT THREA-
DED PART IS INSTALLED. USE RECOMMENDED SPARK
PLUGS ONLY. USING A SPARK PLUG OTHER THAN
SPECIFIED MIGHT COMPROMISE ENGINE PERFORM-
ANCE AND LIFE. CHECK THE GAP BETWEEN THE ELEC-
TRODES WITH A FEELER GAUGE TO AVOID DAMAGING
THE PLATINUM COATING.
•
Check the gap between the electrodes with a feeler gauge.
CAUTION
DO NOT ATTEMPT TO READJUST THE ELECTRODE GAP.
The gap between the electrodes should be be-
tween 0.7 ÷ 0.8 mm (0.027 ÷ 0.031 in). Otherwise,
replace the spark plug (2).
•
Make sure the washer is in good con-
ditions.
Installation:
•
Manually screw the spark plug (2) to
avoid damaging the thread.
•
Tighten using the spanner supplied in
the tool kit. Make each spark plug (2)
Maintenance MXV 450
MAIN - 28