MAINTENANCE
CarburettorBasic setting
Your Husqvarna product has been designed and Y The basic carburettor settings are adjusted during testing
manufactured to speciŢcations that reduce harmful at the factory. The basic setting is richer than the optimal
setting and should be maintained for the Ţrst few hours the
emissions. After the engine has used 8-10 tanks of fuel the machine is in use. The carburettor should then be Ţnely
engine will be run-in. To ensure that it continues to run at peak
performance and to minimise harmful exhaust emissions adjusted. Fine adjustment should be carried out by a
after the running-in period, ask your dealer/service workshop skilled technician.
(who will have a rev counter at their disposal) to adjust your CAUTION! If the cutting attachment rotates when the engine
carburettor.
is idling the idle adjustment screw T should be turned anti-
clockwise until the cutting attachment stops.
WARNING! The complete clutch cover and Rec. idle speed See the Technical data section.
!Recommended max. speed: See the Technical data section.shaft must be Ţtted before the machine is
started, otherwise the clutch can come loose
and cause personal injury.
WARNING! If the idle speed cannot be
Function!adjusted so that the cutting attachment
stops, contact your dealer/service
workshop. Do not use the machine until it
has been correctly adjusted or repaired.
Y The carburettor governs the engineOs speed via the Fine adjustment
throttle control. Air and fuel are mixed in the carburettor.
The air/fuel mixture is adjustable. Correct adjustment is Y When the machine has been �run-in� the carburettor
essential to get the best performance from the machine.should be Ţnely adjusted. The Ţne adjustment should be
carried out by a qualiŢed person. First adjust the L-jet,
Y Adjusting the carburettor means that the engine is
adapted to local operating conditions, e.g. climate, then the idling screw T and then the H-jet.
altitude, petrol and the type of 2-stroke oil.
Conditions
Y The carburettor has three adjustment controls:
Y Before any adjustments are made, make sure that the air
L = Low speed jetŢlter is clean and the air Ţlter cover is Ţtted. If you adjust
H = High speed jetthe carburettor when the air Ţlter is dirty it will result in a
T = Idle adjustment screwleaner mixture when the Ţlter is Ţnally cleaned. This can
lead to serious engine damage.
Y Carefully turn both jets, L and H, so that they are midway
Lbetween fully screwed in and fully screwed out.
Y Do not attempt to adjust the L and H jets beyond either H
stop as this could cause damage.
Y Now start the machine according to the starting
instructions and let it warm up for 10 minutes.T
CAUTION! If the cutting attachment rotates when the
engine is idling the idle adjustment screw T should be
Y The L and H-jets are used to adjust the supply of fuel to turned anti-clockwise until the cutting attachment stops.
match the rate that air is admitted, which is controlled with
the throttle. If they are screwed clockwise the air/fuel ratio Low speed jet L
becomes leaner (less fuel) and if they are turned anti-
clockwise the ratio becomes richer (more fuel). A lean Try to Ţnd the highest idle speed by turning the low speed jet
mixture gives a higher engine speed and a rich mixture L clockwise then anti-clockwise. When the highest speed has
gives a lower engine speed.been found, turn the low speed jet L 1/4 turn anti-clockwise.
Y The T-screw regulates the throttle setting at idle speed. If
the T-screw is turned clockwise this gives a higher idle
speed; turning it anti-clockwise gives a lower idle speed.
CAUTION! If the cutting attachment rotates when the engine
is idling the idle adjustment screw T should be turned anti-
clockwise until the cutting attachment stops.
English � 19 |
ACEC
HUSQVARNA
