Husqvarna 240L - Manual (Page 16)

16
– English
Carburetor
Your Husqvarna product has been designed and
manufactured to specifications 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.
MAINTENANCE
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 first working hours. Thereafter the carburetor
should be finely 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 2 700 rpm.
Recommended max. speed: See ”Technical Data”.
!
WARNING!
The complete clutch cover with shaft
must be fitted before the machine is
started, otherwise 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
carburetor means that the
engine is adapted to local
conditions, for example,
the climate, altitude,
gasoline and the type of
2-stroke oil.
• The carburetor is
equipped with three
adjustment possibilities:
L = Low speed needle
H = High speed needle
T = Idle speed adjuster
screw
• The fuel quantity in relation to the air flow permitted by the
throttle opening is adjusted using the L and H-needles.
Turning the needles clockwise 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.
Fine adjustment
• When the machine has been ”run-in” the carburetor should
be finely adjusted. The fine adjustment should be carried
out by qualified person. First adjust the L-jet, then the
idling screw T and then the H-jet.
Conditions
• Before any adjustments are made the airfilter should be clean
and the airfilter cover fitted. Adjusting the carburetor while
a dirty airfilter is in use will result in a leaner mixture when
the filter is finally 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 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.
NOTE! If the cutting
attachment rotates/moves in
the idling position, turn the
idling speed screw T
counter-clockwise until the
cutting attachment stops.
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.
L
+ 1/4
!