English – 31
Air filter
The air filter must be regularly cleaned from dust and dirt in
order to avoid:
• Carburettor malfunctions
• Starting problems
• Engine power reduction
• Unnecessary wear on
the engine parts
• Abnormal fuel consumption
Clean the air filter daily or
more often if the air is
exceptionally dusty in the
working area.
• Disassemble the air filter by
removing the cylinder cover
and unscrew the filter.
When reassembling, make
sure that the filter is tight
against the filter holder.
Clean the filter by brushing
or shaking it.
• A more thorough cleaning
of the filter is obtained by
washing it in water and
soap.
An air filter, which is used for
some time, cannot be cleaned
completely. Therefore it must
be replaced by a new one,
with regular intervals.
IMPORTANT! A damaged air
filter must always be replaced.
Muffler
The muffler is designed in
order to reduce the noise level
and to direct the exhaust
gases away from the operator.
The exhaust gases are hot
and can contain sparks, which
may cause fire if directed
against dry and combustible
material. Some mufflers are
equipped with a special
screen. If your saw has this
type of muffler, you should
clean the screen at least once
a week. This is done with a
wire brush.
MAINTENANCE
Spark plug
The spark plug condition is influenced by:
• An incorrect carburettor setting.
• Wrong fuel mixture (too much oil in the petrol).
• A dirty air filter.
These factors cause deposits on the spark plug electrodes,
which may result in malfunction and starting difficulties.
If the engine is low on
power, difficult to start or
runs poorly at idling speed,
always check the spark plug
first. If the spark plug is dirty,
clean it and check the
electrode gap. Readjust if
necessary. The correct gap is
0,5 mm (0,020"). The spark
plug should be replaced after
about a month in operation or
earlier if the electrodes are
badly eroded.
IMPORTANT! Always use the
recommended spark plug
type. An incorrect spark plug
can severely damage the
piston/cylinder.
0,5 mm
CAUTION! The screen must be replaced, if damaged. The
saw will be overheated, if the screen is clogged. This
results in damage on the cylinder and the piston. Never use
a saw with a clogged or defective muffler.
!
A muffler fitted with a catalytic converter greatly reduces the
concentration of hydrocarbons (HC), oxides of nitrogen (NO)
and aldehydes emitted with exhaust gases. However, it does
not cut down carbon monoxide (CO), which you cannot smell!
Consequently, never work in an enclosed or badly ventilated
area. Good air circulation should always prevail when working
in snowy hollows, ravines or in confined conditions.
WARNING!
The catalytic converter muffler gets very hot
during and after use. This also applies during
idling. Be aware of the fire hazard, especially
when handling the saw near flammable
substances or vapours.
All bolts are specially made to withstand high temperatures. The
use of any bolts other than genuine Jonsered replacements
may result in damage to the muffler and engine. All bolts must
be checked and tightened as necessary. They should first be
checked after 10 hours running time. NOTE! Bolts (A), which
hold the muffler to the cylinder, are located behind the support
plate (B).
WARNING!
The coating on the inside and outside of the
catalytic converter unit (C) may be poisonous.
Wear gloves whenever you carry out service
work on the catalytic converter.
!
B
C
A
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