Husqvarna 555FX Workshop Manual page 29

Setting the L jet
1. Fit the trimmer head T45 and use 2.7 mm plain cord. The
cord length should be as standard, i.e. reach the knife on the
trimmer guard.
2. Run the engine warm for about 5 minutes.
3. Adjust the L jet using a standard screwdriver anticlockwise
against the stop (rich setting).
4. Now use the special screwdriver art. no. 530 03 55-60.
Press in the locking sleeve on the L jet. The L jet can now be
adjusted without the locking sleeve turning as well.
Adjust the L jet so that the engine reaches its highest speed.
The L-jet is then turned a 1/2 turn anticlockwise. Now release
the locking sleeve back to its home position.
The L jet is now correctly adjusted and the locking sleeve
remains anticlockwise against the stop.
5. If the speed exceeds 3,700 rpm, reduce it with the aid of the
idling speed's T-screw (T) and make a new adjustment in
accordance with point 4.
6. Now adjust the idling speed to 2,800 rpm by turning the T-
screw.
Fuel system
Setting the H jet
1. Fit the trimmer head T45 and use 2.7 mm plain cord. The
2. Run the engine warm for about 5 minutes.
3. Adjust the H jet using a standard screwdriver
4. Now use the special screwdriver art. no. 530 03 55-60.
NOTE!
If the cutting equipment rotates while idling the T-
screw should be turned anticlockwise until it stops
rotating.
Thumb throttle
Dismantle the cable protector (C).
502 50 18-01
Remove the three screws and carefully
separate the two halves of the throttle.
502 50 18-01
cord length should be as standard, i.e. reach the knife on
the trimmer guard.
anticlockwise against the stop.
Press in the locking sleeve on the H jet. The H jet can
now be adjusted without the locking sleeve turning as
well.
Adjust the H jet so that the engine exactly goes from 4-
stroking to 2-stroking.
Now release the locking sleeve back to its home position.
The H jet is now correctly adjusted and the locking sleeve
remains anticlockwise against the stop.
Thumb throttle
Remove the screws (A) and (B).
Lift off the cable protector (C) to
facilitate the following work on the
throttle.
Remove the three screws and carefully
separate the two halves of the throttle.
Do not lose the nut held in the nut
pocket for the screw at the rear.
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