Cooling System; Spark Plug - Husqvarna 325HS75 Operator's Manual

MAINTENANCE
Muffler
NOTE!
Some mufflers are fitted with a catalytic converter. See
"Technicald_ta"to see whether you clearing saw is fitted with a
catalytic converter.
The muffler is designed to
dampen the noise level arid
to direct the exhaust fumes
away from the user. The
exhaust fumes are hot and
can contain sparks, which
can result in fire if the
exhaust fumes are directed
towards a dry arid
inflammable material. Some
mufflers are equipped with a
special spark arrest screerL If
your machine is fitted with
this type of screen it should
be cleaned regularly. This is
done using a wire brush. On
mufflers without a catalytic
converter the screen should
be cleaned weekly, or
replaced if necessary. On
mufflers fitted with a
catalytic converter the
screen should be checked
arid cleaned monthly. If the
screen is damaged it should
be replaced. If the screen is
frequently blocked, this can
be a sign that the function
of the catalytic converter is
impaired. Contact your
dealer to inspect the muffler.
A
blocked screen will cause
the engine to overheat
resulting in damage to the
cylinder arid pistorL Also see
under "_aintenang_ '_
NOTE[
Never use a machine with a
defective muffler.
Cooling system
To maintain as low opera-
ting temperature as possible
the engine is equipped with
a cooling system.
The cooling system consists
of:
1. An air intake on the
starter uniL
2. Cooling fins on the
flywheel.
3. Cooling fins on the
cylinder
4. Cylinder cover (leads
cold air onto the cylin-
der).
Clean the cooling system
using a brush at least once a
week, in difficult conditions
more often.
1
A
dirty or blocked cooling system leads to the engine
overheating resulting in damage to the cylinder and piston.
Spark plug
The condition of the spark plug is affected by:
• An incorrect carburetor setting.
• An incorrect fuel mixture (too much or faulty oil).
• A dirty air filter.
These factors cause deposits on the spark plug electrode that
may result in malfunction or starting difficulties.
If
the machine is low on
power, difficult to start or
runs poorly while idling
always check the spark plug
first before taking other
action.
If the spark plug is dirty,
clean it and at the same time
check that the electrode gap
is 0.5 mm. The spark plug
should be changed after
about one month of
operation or earlier if
necessary.
NOTE!
Always use the
recommended type of spark
plug. An incorrect spark
plug can damage the
cylinder/piston.
_0,5 mm
16
- English