MAINTENANCE
CarburettorBasic setting
Your Husqvarna product has been designed andY The carburettor is set to its basic setting when test run at the
manufactured to specifications that reduce harmfulfactory. The basic setting is richer than the optimal setting
emissions.and should be kept during the machine�s first working
After your unit has been run 8-10 tanks of fuel the enginehours. Thereafter the carburettor should be finely adjusted.
has broken in. To ensure that your unit is at peakFine adjustment should be carried out by a skilled
performance and producing the least amount of harmfultechnician.
emissions after break in, have your authorized servicing
dealer, who has a revolution counter at his disposal, to adjustNOTE! If the cutting attachment rotates/moves while the
your carburettor for optimum operating conditions.engine is idling the T-screw should be turned anti-clockwise
until the cutting attachment stops.
Rec. idling speed: 2 700 rpm.
WARNING!
The complete clutch cover with shaftRecommended max. speed: See Otechnical data�.
!must be fitted before the machine is
started, otherwise the clutch can becomeWARNING!
loose and cause personal 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
correctly adjusted or repaired.
Y The carburettor governs
the engine�s speed via the
Fine adjustment
throttle. Air/fuel is mixed
in the carburettor. TheY When the machine has been �run-in� the carburettor should
air/fuel mixture isbe finely adjusted. The fine adjustment should be carried
out by qualified person. First adjust the L-jet, then the
adjustable. To take
advantage of the engine�sidling screw T and then the H-jet.
optimal output the
adjustment must beConditions
correct.Y Before any adjustments are made the airfilter should be clean
and the airfilter cover fitted. Adjusting the carburettor while
Y The setting of thea dirty airfilter is in use will result in a leaner mixture when
carburettor means thatthe filter is finally cleaned. This can give rise to serious
the engine is adapted toengine damage.
local conditions, forY Carefully turn the L and H needle to the mid point between
example, the climate,fully turned in and fully turned out.
altitude, petrol and theY Do not attempt to adjust the needles beyond the stops as
type of 2-stroke oil.damage can occur.
Y Now start the machine according to the starting instructions
Y The carburettor isand run it warm for 10 minutes.
equipped with threeNOTE! If the cutting attachment rotates/moves the T screw
adjustment possibilities:should be turned anti-clockwise until the cutting attachment
L = Low speed needlestops.
H = High speed needle
T = Idle speed adjusterLow speed needle L
screwTry to find the highest idling
speed, turning the low speed
Y The fuel quantity in relation to the air flow permitted byneedle L clockwise
the throttle opening is adjusted using the L and H-needles.respectively counter-
Turning the needles clockwise gives a leaner fuel mixtureclockwise. When the highest
(less fuel) and turning them anti-clockwise gives a richerspeed has been found, turn
fuel mixture (more fuel). A leaner mixture gives high revsthe low speed needle L 1/4
while a richer mixture give less revs.turn counter-clockwise.
NOTE! If the cutting+ 1/4
Y The T-screw regulates the position of the throttle while theattachment rotates/moves in
engine is idling. Turning the screw clockwise gives a higherthe idling position, turn the
idling speed while turning it anti-clockwise gives a loweridling speed screw T
idling speed.counter-clockwise until the
cutting attachment stops.
L
18 � English |
ACEC
