To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
1 Fins on the ﬂywheel.
2 Cooling ﬁns on the cylinder.
3 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.
The spark plug condition is inﬂuenced by:
Incorrect carburetor adjustment.
An incorrect fuel mixture (too much or incorrect type of
A dirty air ﬁlter.
These factors cause deposits on the spark plug electrodes,
which may result in operating problems and starting
If the machine is low on power, difﬁcult to start or runs poorly
at idle speed: always check the spark plug ﬁrst before taking
any further action. If the spark plug is dirty, clean it and check
that the electrode gap is 0.7 mm (0,028"). The spark plug
should be replaced after about a month in operation or earlier
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 ﬁtted with a suppressor.
The air ﬁlter must be regularly cleaned to remove dust and dirt
in order to avoid:
Loss of engine power
Unnecessary wear to engine parts
Excessive fuel consumption.
Clean the ﬁlter every 25 hours, or more regularly if conditions
are exceptionally dusty.
Cleaning the air ﬁlter
Remove the air ﬁlter cover and take out the ﬁlter. Wash it
clean in warm, soapy water. Ensure that the ﬁlter is dry before
An air ﬁlter that has been in use for a long time cannot be
cleaned completely. The ﬁlter must therefore be replaced with
a new one at regular intervals. A damaged air ﬁlter must
always be replaced.
If the machine is used in dusty conditions the air ﬁlter should
be soaked in oil. See instructions under the heading Oiling the
Oiling the air ﬁlter
Always use HUSQVARNA ﬁlter oil, art. no. 531 00 92-48. The
ﬁlter oil contains a solvent to make it spread evenly through
the ﬁlter. You should therefore avoid skin contact.
Put the ﬁlter in a plastic bag and pour the ﬁlter oil over it.
Knead the plastic bag to distribute the oil. Squeeze the
excess oil out of the ﬁlter inside the plastic bag and pour off
the excess before ﬁtting the ﬁlter to the machine. Never use
common engine oil. This would drain through the ﬁlter quite
quickly and collect in the bottom.