Husqvarna 2009 SMR 450, Owner'S Manual

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SPARK PLUG CHECK
Use NGK CR8EB spark plug (2); the gap is 0.027 in.
A wider gap may cause difficulties in starting engine and in over-
loading coil.
A gap that is too narrow may cause difficulties when accelerat-
ing, when idling the engine or when performing at low
speeds.
Clean the dirt away from the base of the spark plug before re-
moving it from the cylinder after removing the cap (1).
It is very useful to examine the state of the spark plug just after it
has been removed from the engine since the deposits on the plug
and the colour of the insulator provide useful indications.
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 is overheated and insulator tip is vitreous,
white or grey in colour.
CAUTION*: Select a spark plug with a colder or
hotter heat range carefully and cautiously. A
spark plug with too hot a heat range may
lead to preignition and possible engine dam-
age. A spark plug with too cold a heat range
may foul as the result of too much carbon
buildup.
Before refitting the plug, thoroughly clean
the electrodes and the insulator using a
brass-metal brush.
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.
Spark plugs which have cracked insulators or
corroded electrodes should be replaced.
VOLTAGE REGULATOR (TXC-TE-SMR)
The voltage regulator (3) is fitted to the right side of the chassis,
on the front.
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3
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MUM1-250_310_450_510_2009_GB 21-05-2008 9:29 Pagina 34