Husqvarna 326EX-Series - Manual (Page 16)

16
– English
Basic setting
• The carburetor is set to its basic setting when test run at the
factory. The basic setting should be kept during the machine‘s
fi rst working hours. Thereafter the carburetor should be fi nely
adjusted. Fine adjustment should be carried out by a skilled
technician.
NOTE! If the cutting attachment rotates/moves while the engine
is idling the T-screw should be turned anti-clockwise until the
cutting attachment stops.
Rec. idling speed: 2700 rpm.
Recommended max. speed: See ”Technical data”.
MAINTENANCE
Carburetor
Your Husqvarna product has been designed and manufactured
to specifi cations that reduce harmful emissions.
After your unit has been run 8-10 tanks of fuel the engine has
broken in. To ensure that your unit is at peak performance and
producing the least amount of harmful emissions after break
in, have your authorized servicing dealer, who has a revolution
counter at his disposal, to adjust your carburetor for optimum
operating conditions.
WARNING!
The complete clutch cover with shaft must
be fi tted before the machine is started, oth-
erwise the clutch can become loose and
cause personal injury.
!
Operation
• The carburetor governs
the engine‘s speed via the
throttle. Air/fuel is mixed in
the carburetor. The air/fuel
mixture is adjustable. To take
advantage of the engine‘s
optimal output the adjustment
must be correct.
• The setting of the carbure-
tor means that the engine is
adapted to local conditions,
for example, the climate, alti-
tude, gasoline and the type of
2-stroke oil.
• The carburetor is equipped
with three adjustment pos-
sibilities:
L = Low speed needle
H = High speed needle
T = Idle speed adjuster
screw
• The fuel quantity in relation to
the air fl ow permitted by the
throttle opening is adjusted
using the L and H-needles.
Turning the needles clock-
wise gives a leaner fuel
mixture (less fuel) and turning
them anti-clockwise gives a richer fuel mixture (more fuel). A
leaner mixture gives high revs while a richer mixture give less
revs.
• The T-screw regulates the position of the throttle while the
engine is idling. Turning the screw clockwise gives a higher
idling speed while turning it anti-clockwise gives a lower idling
speed.
WARNING!
If the idling speed cannot be adjusted so
that the cutting attachment stops, contact
your service workshop. Do not use the
machine until it has been correctly adjusted
or repaired.
!
Fine adjustment
• When the machine has been ”run-in” the carburetor should
be fi nely adjusted. The fi ne adjustment should be carried
out by qualifi ed person. First adjust the L-jet, then the idling
screw T and then the H-jet.
Conditions
• Before any adjustments are made the airfi lter should be clean
and the airfi lter cover fi tted. Adjusting the carburetor while a
dirty airfi lter is in use will result in a leaner mixture when the
fi lter is fi nally cleaned. This can give rise to serious engine
damage.
• Carefully turn the L and H needle to the mid point between
fully turned in and fully turned out.
• Do not attempt to adjust the needles beyond the stops as
damage can occur.
• Now start the machine according to the starting instructions
and run it warm for 10 minutes.
NOTE! If the cutting attachment rotates/moves the T screw
should be turned anti-clockwise until the cutting attachment
stops.
Low speed needle L
Try to fi nd the highest idling
speed, turning the low speed
needle L clockwise respective-
ly counter-clockwise. When the
highest speed has been found,
turn the low speed needle L
1/4 turn counter-clockwise.
NOTE! If the cutting attach-
ment rotates/moves in the
idling position, turn the idling
speed screw T counter-clock-
wise until the cutting attach-
ment stops.
L
+ 1/4