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18 – English
MAINTENANCE
Cooling system
To maintain as low operating
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 cylinder).
Muffler
NOTE!
Some mufflers are fitted with a catalytic converter. See
“Technical data” to see whether your machine is fitted 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 carburetor
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.
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
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.