SWM RS 125 R 2016 Manuel D'utilisation Et Entretien page 91

SPARK PLUG CHECK
Spark plug (2) gap shall be 0,8 mm (0.31 in.).
A wider gap may cause difficulties in starting the
engine and overload the coil.
A gap that is too narrow may cause difficulties
when accelerating, when idling or poor performance
at low speed.
- Disconnect the connector (1).
- Unscrew the two screws (2), remove the blocking
plate (3), then remove the cap (4) complete of the
coil from the spark plug.
Clean the dirt around the spark plug base before
removing it.
It is very useful to examine the state of the spark
plug just after it has been removed from the engine
since the scale deposits on the plug and the colour
of the insulator provide useful indications.
1
Correct heat rating:
The tip of the insulator should be dry and the colour
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 in-
sulator tip is vitrified (glazed), white or grey in col-
our.
WARNING*: If the spark plug is replaced, use
one with the same rating.
CAUTION*: A spark plug with too hot a heat
range may lead to preignition and possible
engine damage. A spark plug with too cold a
heat range may foul as the result of too much
carbon buildup.
4
2
3
Before refitting the plug, thoroughly clean the
electrodes and the insulator using a metal
brush. Smear some graphite grease on spark
plug thread, do it fully home finger tight then
tighten it to 10÷12 Nm (7,37÷8,85 ft/lb). torque.
Loosen the spark plug then tighten it again to
10÷12 Nm (7,37÷8,85 ft/lb).
Spark plugs which have cracked insulators or
corroded electrodes should be replaced.
- Reassemble the cap together with the coil (4) on
the spark plug.
- Reassemble the blocking plate (3) and tighten
the two screws (2) at 7 Nm (5.1 ft/lb)).
- Reconnect the connector (1).
2
0,7 ÷ 0,8 mm (0,028 ÷ 0,031 in.)
2
EN - 29