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20 – English
MAINTENANCE
Cooling system
To maintain as low an operating temperature as possible the
cut-off saw is equipped with a cooling system.
The cooling system consists of:
1. An air intake on the
starter unit.
2. Air flow guide.
3. Cooling fins on the
flywheel.
4. Cooling fins on the
cylinder
5. Cylinder cover (leads cold
air onto the cylinder).
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.
1
2
3
4
5
Muffler
The muffler is designed in
order to reduce the noise level
and to direct the exhaust
gases away from the opera-
tor. The exhaust gases are
hot and can contain sparks,
which may cause fire if
directed against dry and
combustible material.
Never use a saw with a
clogged or defective muffler.
Ignition system
Spark plug
The condition of the spark plug
is affected by:
• An incorrect carburetor
setting.
• An incorrect fuel mixture
(too much 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
(.020"). 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. (see
chapter ”Technical data”)! An incorrect spark plug can damage
the cylinder/piston.
0,5 mm
IMPORTANT INFORMATION!
This cut-off saw has a green coloured ignition system
with integrated speed governor (order no. 506 02 73-04).
The machine may only be used with such a green
coloured ignition system to prevent the risk of over
revving.