Husqvarna 225H60 - Manual (Page 14)

14
– English
Carburettor
Your Husqvarna product has been designed and manufac-
tured 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 perform-
ance 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 carburet-
tor for optimum operating conditions.
Basic setting
• The carburettor is set to its basic setting when test run at
the factory. The basic setting is richer than the optimal
setting and should be kept during the machine’s first
working hours. Thereafter the carburettor 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.
Recommended idling speed is 2 700 rpm.
Recommended max. speed: See “technical data”.
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.
!
MAINTENANCE
Operation
• The carburettor governs
the engine’s speed via the
throttle. Air/fuel is mixed
in the carburettor. The
air/fuel mixture is
adjustable. To take
advantage of the engine’s
optimal output the
adjustment must be
correct.
• The setting of the
carburettor means that
the engine is adapted to
local conditions, for
example, the climate,
altitude, petrol and the
type of 2-stroke oil.
• The carburettor is equipped with three adjustment possi-
bilities:
H = High speed needle
L = Low 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.
WARNING!
The complete clutch cover and gear must
be fitted before the machine is started,
otherwise the clutch may come loose and
cause injury.
!
H L T
T
Adjusting the idle speed, T
Adjust the idling speed with
the screw T, if it is necessary
to readjust. First turn the
idle speed adjusting screw T
clockwise until the cutting
attachment starts to rotate/
move.
Then turn, counter-clock-
wise until the cutting
attachment stops. A correctly
adjusted idle speed setting
occurs when the engine runs
smoothly in every position.
It should also be good
margin to the rpm when the
cutting attachment starts to
move.
CAUTION! Contact your servicing dealer, if the idle speed
setting cannot be adjusted so that the cutting attachment
stops. Do not use the machine until it has been properly
adjusted or repaired.
Correctly adjusted carburettor
A correctly adjusted carburettor means that the machine
accelerates without hesitation and the machine 4-cycles a little
at max speed. Furthermore, the cutting attachment must not
rotate/move at idling. A too lean adjusted low speed needle L
may cause starting difficulties and bad acceleration.
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.