Husqvarna DUAL PURPOSE TE 610 I.E Owner's Manual page 92

SPARK PLUG (Fig. 22)
The spark plug should be removed, cleaned,
checked and gap adjusted carry out the
cleaning operations das described in the
"periodical maintenance card" Gap (A)
must be 0.022÷0.026 in. (socket wrench for
spark plug supplied with tools kit). Remove
any grease and dirt located around the plug
base before removing it. Careful inspection
of the spark plug should be made as soon as
removed, because deposits and the colour
of the insulator provide useful information
about spark plug heat range, carburation,
lubrication, ignition system and about
general condition of the
engine. A plug with rust brown to tan powdery
deposit on the ceramic insulator, around the
base of the central electrode, indicates that
carburation, ignition system and spark-plug
heat range are correct.
30
2-ENG 8000 B0836.indd 30 2-ENG 8000 B0836.indd 30
White, dry, glassy looking deposits indicate
an overheated plug, causing too weak
airfuel mixture at hot running engine or
improper ignition timing. A black, sooty
deposit indicates the air- fuel mixture is too
rich, or faulty ignition. Before attempting to
install the spark plug, clean, using a small
metal brush or a sand blast cleaner. Apply
a little graphite grease to the spark plug
thread; fit and screw the spark plug by
hand then tighten to the torque of 10÷12
Nm- 7.4÷8.9 ft/lb. Loosen the spark plug
then tighten it again to the torque of 10÷12
Nm- 7.4÷8.9 ft/lb.
Plugs with a cracked insulator, or eroded
electrodes should be replaced.
FIG. 22
1. Spark plug
CAUTION*: Never use a spark plug of an
improper heat range.
CAUTION*: The spark plug must be
securely tightened. An improperly
tightened plug can become very hot
and possibly damage the engine.
26-09-2007 10:05:12 26-09-2007 10:05:12