MAINTENANCE
Low speed jet L (240R, 240F, 250R, 252RX)High speed jet H (250R, 252RX)
Try to Ţnd the highest idle speed by turning the low speed jet The high speed jet H affects the engine power, speed,
L clockwise then anti-clockwise. When the highest speed has temperature and fuel consumption. If the high speed jet H is
been found, turn the low speed jet L 1/4 turn anti-clockwise.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 + 1/4
full speed for more than 10 seconds.
Setting procedure without a load (Blade can be
used)
The machine is equipped with speed control in the ignition
Lsystem. It is extremely important to be aware of this when
adjusting the carburettor.
CAUTION! If the cutting attachment rotates when the engine
is idling the idle adjustment screw T should be turned anti-250R, 252RX: Speed control at: 13500 rpm
clockwise until the cutting attachment stops.When attempting to adjust the speed over that speciŢed, the
speed is not changed, but only causes the engine to receive
Fine adjustment of the idle speed Ttoo little fuel resulting in a large risk of engine failure.
Adjust the idle speed using the idle adjustment screw T, if it is Run the machine warm for approximately 5 minutes
necessary to readjust. First turn the idle adjustment screw T alternating between short intervals of full throttle and idling.
clockwise until the cutting attachment starts to rotate. Then When the carburettor is to be adjusted, apply full throttle and
turn the screw anticlockwise until the cutting attachment turn the H-needle anti-clockwise until the engine speed
stops. The idle speed is correctly adjusted when the engine reaches 10,500-11,000 r/min (burbles) or until the cap
will run smoothly in every position. The idle speed should also reaches its stop position. Now turn the H-needle slowly
be well below the speed at which the cutting attachment starts clockwise until the engine reaches the speed when the speed
to rotate.control comes into force. In some cases, speed control can
come into force at 200-300 revs below or above that speciŢed.
It is important that you do not continue to turn the H-needle WARNING! If the idle speed cannot be
clockwise when the engine speed has stabilised. Screw the adjusted so that the cutting attachment
!H-needle (anti-clockwise) a few tenths of a turn instead.
stops, contact your dealer/service
workshop. Do not use the machine until it
has been correctly adjusted or repaired.
High speed jet H (240R, 240F)
The high speed jet H affects the engine power, speed,
temperature and fuel consumption. If the high speed jet H is H
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
Setting procedure with a load (Trimmer head
full speed for more than 10 seconds.should be used)
Apply full throttle and turn the high speed jet H very slowly
Ensure the length of the trimmer cord is correct, i.e. exactly
clockwise until the engine slows down. Then turn the high
speed jet H very slowly anticlockwise until the engine starts to reaches the knife on the trimmer guard. Use either 3 mm or
run unevenly. Now turn the high speed jet H slowly clockwise 3.3 mm diameter trimmer cord.
a little way until the engine runs smoothly. Run the machine warm for about 5 minutes mostly at full
throttle. When the carburettor is to be adjusted, apply full
throttle and turn the H-needle anti-clockwise until the engine
burbles or until the cap reaches its stop position. (If the engine
runs smoothly when the cap is in its stop position no further
adjustment is necessary!) Turn the H-needle slowly clockwise
until the engine runs absolutely smoothly. (Burbling has
stopped completely). Now screw the H-needle (anti-
H
clockwise) a few tenths of a turn.
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 �ange 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 H
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,
CAUTION! For optimum adjustment of the carburettor,
contact a qualiŢed dealer/service workshop that has a contact a qualiŢed dealer/service workshop that has a
revolution counter at their disposal. revolution counter at their disposal.
30 � English |
ACEC
