MAINTENANCE
CarburettorBasic setting
Your Husqvarna product has been designed and ? 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 blades move while the engine is idling the T
carburettor.
screw should be turned anti-clockwise until they stop.
Rec. idle speed 2700 rpm
WARNING! The complete clutch cover and
Recommended max. speed: See the Technical data section.
!gear housing must be Ţtted before the
machine is started, otherwise the clutch may
come loose and cause personal injury.WARNING! If the idle speed cannot be
adjusted so that the cutting attachment
!
Functionstops, contact your dealer/service
workshop. Do not use the machine until it
has been correctly adjusted or repaired.
? The carburettor governs the engine?s speed via the Fine adjustment
throttle control. Air and fuel are mixed in the carburettor. ? When the machine has been ?run-in? the carburettor
The air/fuel mixture is adjustable. Correct adjustment is should be Ţnely adjusted. The Ţne adjustment should be
essential to get the best performance from the machine.carried out by a qualiŢed person. First adjust the L-jet,
? Adjusting the carburettor means that the engine is then the idling screw T and then the H-jet.
adapted to local operating conditions, e.g. climate,
altitude, petrol and the type of 2-stroke oil.Conditions
? The carburettor has three adjustment controls: ? Before any adjustments are made, make sure that the air
Ţlter is clean and the air Ţlter cover is Ţtted. If you adjust
L = Low speed jetthe carburettor when the air Ţlter is dirty it will result in a
H = High speed jetleaner mixture when the Ţlter is Ţnally cleaned. This can
T = Idle adjustment screwlead to serious engine damage.
H? Carefully turn both jets, L and H, so that they are midway LT
between fully screwed in and fully screwed out.
? Do not attempt to adjust the L and H jets beyond either
stop as this could cause damage.
? Now start the machine according to the starting
instructions and let it warm up for 10 minutes.
CAUTION! If the blades move while the engine is idling the T
screw should be turned anti-clockwise until they stop.
? The L and H-jets are used to adjust the supply of fuel to
Low speed jet L
match the rate that air is admitted, which is controlled with
the throttle. If they are screwed clockwise the air/fuel ratio Try to Ţnd the highest idle speed by turning the low speed jet
becomes leaner (less fuel) and if they are turned anti-L clockwise then anti-clockwise. When the highest speed has
clockwise the ratio becomes richer (more fuel). A lean been found, turn the low speed jet L 1/4 turn anti-clockwise.
mixture gives a higher engine speed and a rich mixture
gives a lower engine speed.L
+ 1/4
? 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.
L
CAUTION! If the blades move while the engine is idling the T
screw should be turned anti-clockwise until they stop.
16 - English |
ACEC
