MAINTENANCE
Carburetor
Basic setting
•
The basic carburetor settings are adjusted during testing
at the factory. The basic setting is richer than the optimal
setting and should be maintained for the first few hours the
machine is in use. The carburettor should then be finely
adjusted. Fine adjustment should be carried out by a
skilled technician.
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful
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
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
carburettor.
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.
WARNING! The complete clutch cover and
shaft must be fitted before the machine is
started, otherwise the clutch can come loose
and cause personal injury.
!
Rec. idle speed 2700 rpm
Recommended max.speed: See theTechnical data section.
WARNING! If the idle speed cannot be
adjusted so that the cutting attachment
stops, contact your dealer/service
!
Carburetor adjustment
The carburettor can be designed in different ways, depending
on the existing environmental and emissions legislation.
Some machines are equipped with movement limiters on the
carburettor’s adjuster screws. These limit the adjustment
range to a maximum of 1/2 turn.
workshop. Do not use the machine until it
has been correctly adjusted or repaired.
Fine adjustment
When the machine has been ”run-in” the carburetor should be
finely adjusted. The fine adjustment should be carried out
by a qualified person. First adjust the L-jet, then the idling
screw T and then the H-jet.
H
L
1
/2
1/2
Conditions
•
Before any adjustments are made, make sure that the air
filter is clean and the air filter cover is fitted. If you adjust
the carburettor when the air filter is dirty it will result in a
leaner mixture when the filter is finally cleaned. This can
lead to serious engine damage.
Function
•
The carburetor governs the engine’s speed via the throttle
control. Air and fuel are mixed in the carburetor. The air/
fuel mixture is adjustable. Correct adjustment is essential
to get the best performance from the machine.
•
•
•
Carefully turn both jets, L and H, so that they are midway
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.
•
•
The setting of the carburetor means that the engine is
adapted to local conditions, for example, the climate,
altitude, fuel and the type of 2-stroke oil.
Now start the machine according to the starting
instructions 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.
The carburetor has three adjustment controls:
L = Low speed jet
H = High speed jet
Low speed jet L
T = Idle adjustment screw
Try to find the highest idling speed, turning the low speed
needle L clockwise respectively counter-clockwise.When the
highest speed has been found, turn the low speed needle L 1/
4
turn counter-clockwise.
•
•
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
gives a lower engine 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.
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.
English – 27
| Categories | Chainsaw Manuals, Husqvarna Chainsaw Manuals |
|---|---|
| Tags | Husqvarna 343F, Husqvarna 343FR, Husqvarna 343R, Husqvarna 345FX, Husqvarna 345FXT, Husqvarna 345RX |
| Model Year | 2006, 2007, 2008, 2009, 2010 |
| Download File |
|
| Document Type | Operator's Manual |
| Language | English |
| Product Brand | Husqvarna, Chainsaw |
| Document File Type | |
| Publisher | husqvarna.com |
| Wikipedia's Page | Husqvarna |
| Copyright | Attribution Non-commercial |
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