MAINTENANCE
CarburettorBasic setting
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmfulY The carburettor is set to its basic setting when test run at the
emissions.factory. The basic setting is richer than the optimal setting and
After your unit has been run 8-10 tanks of fuel the engineshould be kept during the machineOs first working hours.
has broken in. To ensure that your unit is at peakThereafter the carburettor should be finely adjusted. Fine
performance and producing the least amount of harmfuladjustment should be carried out by a skilled technician.
emissions after break in, have your authorized servicing
dealer, who has a revolution counter at his disposal, toNOTE! If the blade rotates while the engine is idling the T screw
adjust your carburettor for optimum operating conditions.should be turned anticlockwise until the cutting attachment
stops.
Rec. idling speed: 2 700 rpm.
WARNING!Rec. max speed: See �Technical data�.
The complete clutch cover with shaft must
!be fitted before the machine is started,WARNING!
otherwise the clutch can become loose andIf the idling speed cannot be adjusted so that
cause personal injury.
!the cutting attachment stops, contact your
service workshop. Do not use the machine
until it has been correctly adjusted or
repaired.
Operation
Y The carburettor governsFine adjustment
the engineOs speed via the
Y When the machine has been �run-in� the carburettor should
throttle. Air/fuel is mixed inbe finely adjusted. The fine adjustment should be carried
the carburettor. The air/fuel
mixture is adjustable. Toout by qualified person. First adjust the L-jet, then the idling
screw T and then the H-jet.
take advantage of the
engineOs optimal output the
adjustment must be correct.Conditions
Y Before any adjustments are made the air filter should be clean
Y The setting of theand the air filter cover fitted. Adjusting the carburettor while a
carburettor means that thedirty air filter is in use will result in a leaner mixture when the
engine is adapted to localfilter is finally cleaned. This can give rise to serious engine
conditions, for example, thedamage.
climate, altitude, petrol andY Turn the L and H needles carefully to the middle point
the type of 2-stroke oil.between fully screwed in and fully screwed out.
Y Do not attempt to adjust the needles beyond the stops as
Y The carburettor is equippeddamage can occur.
with three adjustmentY Now start the machine as set out in the start instructions and
possibilities:run it warm for 10 minutes.
L = Low speed needleNOTE! If the cutting equipment rotates/moves while idling the
H= High speed needleT screw should be turned anticlockwise until the cutting
T = Idle speed adjusterequipment stops.
screw
Low speed needle L
Try to find the highest idling
Y The fuel quantity in relation to the air flow permitted by thespeed, turning the low speed
throttle opening is adjusted using the L and H-needles.needle L clockwise
Turning the needles clockwise gives a leaner fuel mixturerespectively counter-
(less fuel) and turning them anticlockwise gives a richer fuelclockwise. When the highest
mixture (more fuel). A leaner mixture gives high revs while aspeed has been found, turn
richer mixture give less revs.the low speed needle L 1/4
turn counter-clockwise.
Y The T-screw regulates the position of the throttle while theNOTE! If the cutting
engine is idling. Turning the screw clockwise gives a higherattachment rotates/moves in
idling speed while turning it anticlockwise gives a lower idlingthe idling position, turn the
speed.idling speed screw T counter-
clockwise until the cutting
attachment stops.
+ 1/4
L
16 � English |
ACEC
HUSQVARNA
