20 – English
MAINTENANCE
Cooling system
To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
1 Air intake on the starter.
2 Fins on the ywheel.
3 Cooling ns on the cylinder.
4 Cylinder cover (directs cold air over the cylinder).
Clean the cooling system with a brush once a week, more
often in demanding conditions. A dirty or blocked cooling
system results in the machine overheating which causes
damage to the piston and cylinder.
Spark plug
The spark plug condition is inuenced by:
Incorrect carburettor adjustment.
An incorrect fuel mixture (too much or incorrect type of
oil).
A dirty air lter.
These factors cause deposits on the spark plug electrodes,
which may result in operating problems and starting
difculties.
If the machine is low on power, difcult to start or runs poorly
at idle speed: always check the spark plug rst before taking
any further action. If the spark plug is dirty, clean it and check
that the electrode gap is 0.5 mm. The spark plug should be
replaced after about a month in operation or earlier if
necessary.
CAUTION! Always use the recommended spark plug type!
Use of the wrong spark plug can damage the piston/cylinder.
Check that the spark plug is tted with a suppressor.
Air lter
The air lter must be regularly cleaned to remove dust and dirt
in order to avoid:
Carburettor malfunctions
Starting problems
Loss of engine power
Unnecessary wear to engine parts.
Excessive fuel consumption.
Clean the lter every 25 hours, or more regularly if conditions
are exceptionally dusty.

Cleaning the air lter

Remove the air lter cover and take out the lter. Wash it
clean in warm, soapy water. Ensure that the lter is dry before
retting it.
An air lter that has been in use for a long time cannot be
cleaned completely. The lter must therefore be replaced with
a new one at regular intervals. A damaged air lter must
always be replaced.
If the machine is used in dusty conditions the air lter should
be soaked in oil. See instructions under the heading Oiling the
air lter.

Oiling the air lter

Always use HUSQVARNA lter oil, art. no. 531 00 92-48. The
lter oil contains a solvent to make it spread evenly through
the lter. You should therefore avoid skin contact.
Put the lter in a plastic bag and pour the lter oil over it.
Knead the plastic bag to distribute the oil. Squeeze the
excess oil out of the lter inside the plastic bag and pour off
the excess before tting the lter to the machine. Never use
common engine oil. This would drain through the lter quite
quickly and collect in the bottom.
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