SWM VAREZ - Spark Plug Check

41- EN
SPARK PLUG CHECK
Spark plug gap must be 0.6 ÷ 0.8 mm.
A greater gap may cause starting difficulties and
coil overload, a shorter gap may cause problems
with acceleration, idling and low speed perfor-
mance.
To reach the spark plug, carry out the following
removal operations:
-Remove the side panels;
-Remove the front fairing;
-Remove the tank plug;
-remove the tank cover;
-overturn the frame and the tank;
-remove the filter box.
CAUTION
As this procedure is quite complex, it is advised to
contact an SWM Dealer for spark plug check/re-
placement.
IT is very useful to examine the status of the spark
plug just after it has been removed from its seat,
since the deposits and the colour of the insulator
provide useful information.
Correct heat rating:
The tip of the insulator should be dry and the col-
our should be light brown or grey.
High heat rating:
In this case, the insulator tip is dry and covered
with dark deposits.
Low heat rating:
In this case, the spark plug has overheated and
insulator tip is vitrified (glazed), white or grey in
colour.
WARNING
If the spark plug is replaced, use one with the
same rating.
WARNING
A spark plug with heat rating too high can cause
pre-ignition and possible engine damage A spark
plug with heat rating too low can cause a signifi-
cant increase in carbon deposits.
CAUTION
Carefully change the spark plug, if necessary, us-
ing one having the same rating.
Before refitting the plug, thoroughly clean the
electrodes and the insulator using a metal brush.
Smear graphite grease on spark plug thread,
manually screw it fully home, then tighten it to a
torque of 10÷12 Nm. Loosen the spark plug then
tighten it again to 10÷12 Nm.
Spark plugs with cracked insulators or corroded
electrodes should be replaced.