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MAINTENANCE
Fine adjustment of the idle speed T
Adjust the idle speed using the idle adjustment screw T, if it is
necessary to readjust. First turn the idle adjustment screw T
clockwise until the cutting attachment starts to rotate. Then
turn the screw anticlockwise until the cutting attachment
stops. The idle speed is correctly adjusted when the engine
will run smoothly in every position. The idle speed should also
be well below the speed at which the cutting attachment starts
to rotate.
High speed jet H
The high speed jet H affects the engine power, speed,
temperature and fuel consumption. If the high speed jet H is
set too lean (screwed in too far) the engine speed will be too
high and cause engine damage. Do not let the engine run at
full speed for more than 10 seconds.
Setting procedure with a load (Trimmer head
should be used)
Ensure the length of the trimmer cord is correct, i.e. exactly
reaches the knife on the trimmer guard. Use either 3 mm or
3.3 mm diameter trimmer cord.
Apply full throttle and turn the high speed jet H very slowly
clockwise until the engine slows down. Then turn the high
speed jet H very slowly anticlockwise until the engine starts to
run unevenly. Now turn the high speed jet H slowly clockwise
a little way until the engine runs smoothly.
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 (355RX)
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.
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.
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.
!
WARNING! If the idle speed cannot be
adjusted so that the cutting attachment
stops, contact your dealer/service
workshop. Do not use the machine until it
has been correctly adjusted or repaired.
H
4 mm