MAINTENANCE
CarburettorCAUTION! If the cutting attachment rotates when the engine
is idling the idle adjustment screw T should be turned anti-
Your Husqvarna product has been designed and clockwise until the cutting attachment stops.
manufactured to speciŢcations that reduce harmful
Rec. idle speed 2700 rpm
emissions. After the engine has used 8-10 tanks of fuel the
engine will be run-in. To ensure that it continues to run at peak Recommended max. speed: See the Technical data section.
performance and to minimise harmful exhaust emissions
after the running-in period, ask your dealer/service workshop
(who will have a rev counter at their disposal) to adjust your WARNING! If the idle speed cannot be
carburettor.adjusted so that the cutting attachment
!stops, contact your dealer/service
workshop. Do not use the machine until it
WARNING! The complete clutch cover and has been correctly adjusted or repaired.
!shaft must be Ţtted before the machine is
started, otherwise the clutch can come loose
Fine adjustmentand cause personal injury.
? When the machine has been ?run-in? the carburettor
Functionshould be Ţnely adjusted. The Ţne adjustment should be
carried out by a qualiŢed person. First adjust the L-jet,
then the idling screw T and then the H-jet.
? The carburettor governs the engine?s speed via the Conditions
throttle control. Air and fuel are mixed in the carburettor. ? Before any adjustments are made, make sure that the air
The air/fuel mixture is adjustable. Correct adjustment is Ţlter is clean and the air Ţlter cover is Ţtted. If you adjust
essential to get the best performance from the machine.the carburettor when the air Ţlter is dirty it will result in a
leaner mixture when the Ţlter is Ţnally cleaned. This can
? Adjusting the carburettor means that the engine is lead to serious engine damage.
adapted to local operating conditions, e.g. climate,
altitude, petrol and the type of 2-stroke oil.? Carefully turn both jets, L and H, so that they are midway
between fully screwed in and fully screwed out.
? The carburettor has three adjustment controls:
? Do not attempt to adjust the L and H jets beyond either
L = Low speed jetstop as this could damage the engine.
H = High speed jet
? Now start the machine according to the starting
T = Idle adjustment screwinstructions and let it warm up for 10 minutes.
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.
Low speed jet L
Try to Ţnd the highest idle speed by turning the low speed jet
L clockwise then anti-clockwise. When the highest speed has
been found, turn the low speed jet L 1/4 turn anti-clockwise.
+ 1/4
? The L and H-jets are used to adjust the supply of fuel to
match the rate that air is admitted, which is controlled with
the throttle. If they are screwed clockwise the air/fuel ratio
becomes leaner (less fuel) and if they are turned anti-
clockwise the ratio becomes richer (more fuel). A lean
mixture gives a higher engine speed and a rich mixture L
gives a lower engine speed.
? The T-screw regulates the throttle setting at idle speed. If CAUTION! If the cutting attachment rotates when the engine
the T-screw is turned clockwise this gives a higher idle is idling the idle adjustment screw T should be turned anti-
speed; turning it anti-clockwise gives a lower idle speed.clockwise until the cutting attachment stops.
Basic setting
? The basic carburettor settings are adjusted during testing
at the factory. The basic setting is richer than the optimal
setting and should be maintained for the Ţrst few hours the
machine is in use. The carburettor should then be Ţnely
adjusted. Fine adjustment should be carried out by a
skilled technician.
English - 23 |
ACEC
