APRILIA SXV / RXV 450 550 Use And Maintenance Book page 94

MAINTENANCE
WARNING
When changing the spark plug (2), 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 the recommended type of spark plugs only,
see (TECHNICAL DATA), in order to avoid
compromising the life and performance of the
engine.
Electrode gap should be checked using a wire
gauge to avoid damaging the platinum coating.
• Check electrode gap with a wire gauge.
WARNING
Never attempt to adjust electrode gap.
Electrode gap should be 0.7 - 0.8 mm (0.027 - 0.031 in.);
change spark plug (2) if reference value is not respected.
•
Make sure that the washer is in good condition.
For the installation:
• Position the washer and screw in the spark plug (2) by
hand in order not to damage the thread.
•
Tighten the spark plug (2) with the wrench included in
the tool kit, making half a turn to compress the washer.
Spark plug (2) tightening torque: 12 Nm (1.2 kgm).
WARNING
The spark plug (2) must be well tightened,
otherwise the engine may overheat and be
seriously damaged.
•
Position the spark plug (2) cap (1) properly to prevent it
from coming off due to engine vibration.
NOTE Repeat operations on spark plug (2) on the other
cylinder.
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SXV / RXV 450 - 550