To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
Air intake on the starter.
Fins on the ﬂywheel.
Cooling ﬁns on the cylinder.
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
A dirty air ﬁlter.
These factors cause deposits on the spark plug
electrodes, which may result in operating problems and
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 0.020 inch (0.5
18 – English
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 ﬁtted with a
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 reﬁtting it.
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.