MAINTENANCE
CarburettorBasic setting
Your Husqvarna product has been designed and manufac-Y The carburettor is set to its basic setting when test run at
tured to specifications that reduce harmful emissions.the factory. The basic setting is richer than the optimal
After your unit has been run 8-10 tanks of fuel the enginesetting and should be kept during the machineOs first
has broken in. To ensure that your unit is at peak perform-working hours. Thereafter the carburettor should be finely
ance and producing the least amount of harmful emissionsadjusted. Fine adjustment should be carried out by a skilled
after break in, have your authorized servicing dealer, who hastechnician.
a revolution counter at his disposal, to adjust your carburet-
NOTE! If the cutting attachment rotates/moves while the
tor for optimum operating conditions.
engine is idling the T-screw should be turned anti-clockwise
until the cutting attachment stops.
WARNING!Recommended idling speed is 2 700 rpm.
The complete clutch cover and gear must
Recommended max. speed: See Otechnical data�.
!be fitted before the machine is started,
otherwise the clutch may come loose and
WARNING!
cause injury.
If the idling speed cannot be adjusted so
!that the cutting attachment stops,
contact your service workshop. Do not
Operationuse the machine until it has been
Y The carburettor governscorrectly adjusted or repaired.
the engineOs speed via the
throttle. Air/fuel is mixed
in the carburettor. The
Adjusting the idle speed, T
air/fuel mixture isH L T
Adjust the idling speed with
adjustable. To take
the screw T, if it is necessary
advantage of the engineOs
to readjust. First turn the
optimal output theT
idle speed adjusting screw T
adjustment must be
clockwise until the cutting
correct.
attachment starts to rotate/
move.
Y The setting of the
Then turn, counter-clock-
carburettor means that
wise until the cutting
the engine is adapted to
attachment stops. A correctly
local conditions, for
adjusted idle speed setting
example, the climate,
occurs when the engine runs
altitude, petrol and the
smoothly in every position.
type of 2-stroke oil.
It should also be good
margin to the rpm when the
Y The carburettor is equipped with three adjustment possi-
cutting attachment starts to
bilities:
move.
H = High speed needle
CAUTION! Contact your servicing dealer, if the idle speed
L = Low speed needle
setting cannot be adjusted so that the cutting attachment
T = Idle speed adjuster screw
stops. Do not use the machine until it has been properly
adjusted or repaired.
Y 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
Correctly adjusted carburettor
while a richer mixture give less revs.
A correctly adjusted carburettor means that the machine
accelerates without hesitation and the machine 4-cycles a little
Y The T-screw regulates the position of the throttle while the
at max speed. Furthermore, the cutting attachment must not
engine is idling. Turning the screw clockwise gives a higher
rotate/move at idling. A too lean adjusted low speed needle L
idling speed while turning it anti-clockwise gives a lower
may cause starting difficulties and bad acceleration.
idling speed.
A too lean adjusted high speed needle H gives lower power =
less capacity, bad acceleration and/or damage to the engine.
A too rich adjustment of the two speed needles L and H gives
acceleration problems or too low working speed.
14 � English |
ACEC
