English –
17
Cooling system
To maintain as low operat-
ing temperature as possible
the engine is equipped with
a cooling system.
The cooling system consists
of:
1. An air intake on the
starter unit.
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.
A dirty or blocked cooling
system leads to the engine
overheating resulting in
damage to the cylinder and
piston.
MAINTENANCE
Muffler
NOTE!
Some mufflers are fitted with catalytic converters. See “Tech-
nical data” to find out if your machine is equipped with a
catalytic converter.
The muffler is designed to
dampen the noise level and 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 and inflammable mate-
rial. Some mufflers are
equipped with a special spark
arrest screen. 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 and
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 and
piston. Also see under
“Maintenance”.
NOTE!
Never use a machine with a
defective muffler.
!
WARNING!
Mufflers fitted with catalytic converters
become extremely hot during use and after
stopping. This also applies at idling
speeds. Contact can result in burns to the
skin. Be observant to the risk of fire!
1
4
3
2
Spark plug
The condition of the spark plug is affected by:
• An incorrect carburettor 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
