CAUTION! Never use a machine with a defective mufﬂer.
WARNING! Mufﬂers ﬁtted with catalytic
converters get very hot during use and
remain so for some time after stopping. This
also applies at idle speed. Contact can result
in burns to the skin. Remember the risk of
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 ﬂywheel.
3 Cooling ﬁns 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.
The spark plug condition is inﬂuenced by:
Incorrect carburettor 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 0.5 mm. The spark plug should be
replaced after about a month in operation or earlier if
CAUTION! Always use the recommended spark plug type!
Use of the wrong spark plug can damage the piston/cylinder.
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