Husqvarna 142RB - Manual (Page 19)

English –
19
MAINTENANCE
Carburettor
Idle speed
adjustment (T)
• Check that the air filter is
clean. When the idle
speed is correct, the
trimmerhead will not
rotate. If adjustment is
required, close (clockwise)
the T-screw, with the
engine running, until the
trimmerhead starts to
rotate (3 400 rpm). Open
(counterclockwise) the
screw until the
trimmerhead stops. You
have reached the correct
idle speed (abt 2 600 rpm)
when the engine runs
smoothly in all positions
well below the rpm when
the trimmerhead starts to
rotate.
!
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 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.
!
WARNING!
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.
NOTE!
The machine should only be used for short periods at its
highest speed.
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.
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+ +
NOTE!
Some mufflers are fitted with a catalytic converter. See “Techni-
cal data” to see whether you brush cutter is fitted with a
catalytic converter.
The muffler is designed to
dampen the noise level and
to direct the exhaust fumes
away from the user. The
exhaust fumes are hot and
can contain sparks, which
can result in fire if the
exhaust fumes are directed
towards a dry and inflamma-
ble material. Some mufflers
are equipped with a special
spark arrestor screen. If your
machine is fitted with this
type of screen it should be
cleaned regularly. This is
done using a wire brush. On
mufflers without a catalytic
converter the screen should
be cleaned weekly, or
replaced if necessary. On
mufflers fitted with a
catalytic converter the screen
should be checked and
cleaned monthly. If the
screen is damaged it should
be replaced.
Muffler
If the screen is frequently blocked, this can be a sign that the
function of the catalytic converter is impaired. Contact your
dealer to inspect the muffler. A blocked screen will cause the
engine to overheat resulting in damage to the cylinder and
piston. Also see under “Maintenance”.
NOTE! Never use a machine with a defective muffler.