Low speed jet L
Try to ﬁnd the highest idling speed, turning the low speed
needle L clockwise respectively counter-clockwise. When
the highest speed has been found, turn the low speed
needle L 1/4 turn counter-clockwise.
CAUTION! If the cutting attachment rotates when the
engine is idling the idle adjustment screw T should be
turned anti-clockwise until the cutting attachment stops.
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.
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
22 – English
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.
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
Note that the engine should not be under load when you
adjust the high speed jet H. You should therefore remove
the cutting attachment, nut, support ﬂange and drive disc
before adjusting the high speed jet H.
The high speed jet H is adjusted correctly when the
machine burbles a little. If the machine races then the
setting is too lean. If the engine produces a lot of smoke
and burbles a lot then the setting is too rich.
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
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.
1151020-95 Rev. 2 2008-03-10