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smoothly. (Burbling has stopped completely). Now screw
the H-needle (anti-clockwise) a few tenths of a turn.
CAUTION! For optimum adjustment of the carburettor,
contact a qualified dealer/service workshop that has a
revolution counter at their disposal.
Correctly adjusted carburetor
When the carburetor is correctly adjusted the machine will
accelerate without hesitation and burble a little at
maximum speed. It is also important that the cutting
attachment does not rotate at idle. If the low speed jet L is
set too lean it may cause starting difficulties and poor
acceleration. If the high speed jet H is set too lean it will
result in less power, less performance, poor acceleration
and/or damage to the engine. If both the L and H jets are
set too rich it will results in acceleration problems or too
low a working speed.
Adjusting the start throttle speed (343FR,
343FRM, 343R, 345RX)
The correct start throttle speed is set by means of an
adjuster on the rear of the handle next to the cable. Use
this screw (5 mm Allen screw) to increase or decrease the
start throttle speed.
5 mm
Proceed as follows:
1
Run the machine at idle.
2
Press the start throttle lock as described under the
heading Starting and stopping.
3
If the start throttle speed is too low (below 4000 rpm),
turn the adjuster screw A clockwise until the cutting
attachment starts to rotate. Then turn A clockwise a
further 1/2 turn.
4
If the start throttle speed is too high, turn the adjuster
screw A anticlockwise until the cutting attachment
stops. Then turn adjuster screw A clockwise a further
1/2 turn.
32 – English
MAINTENANCE
H
Muffler
CAUTION! Some mufflers are fitted with a catalytic
converter. See chapter on Technical data to see whether
your machine is fitted with a catalytic converter.
The muffler is designed 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 spark arrestor
screen. If your machine has this type of muffler, you
should clean the screen at least once a week. This is best
done with 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 if necessary cleaned, monthly. If the
screen is damaged it should be replaced.
If the screen is frequently blocked, this can be a sign that
the performance of the catalytic converter is impaired.
Contact your dealer to inspect the muffler. A blocked
screen will cause the machine to overheat and result in
damage to the cylinder and piston.
CAUTION! Never use a machine with a defective muffler.
WARNING! Mufflers fitted with catalytic
!
converters get very hot during use and
remain so for some time after stopping.
This also applies at idle speed. Contact
can result in burns to the skin.
Remember the risk of fire!
Cooling system
To keep the working temperature as low as possible the
machine is equipped with a cooling system.
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