Repair instructions
Carburettor – adjustment
If it is not possible to check the maximum speed
with a tachometer then the H jet should not be set
to a weaker mixture than the basic factory setting.
For instructions on adjusting the EPA carburettor
see appendix A.
The recommended maximum speed must not be
exceeded.
Adjusting the carburettor involves adjusting the
engine to the local conditions e.g. climate, alti-
tude, fuel and type of two-stroke oil.
NOTE!
The carburettor is equipped with three adjustment
options.
If the chain turns at idling speed, the T
screw should be turned anti-clockwise
until the chain stops.
L = Low speed jet
H = High speed jet
T = Idling adjustment screw
Fine adjustment
Once the chainsaw is “run in” the carburettor should
be readjusted. First adjust the L jet screw, then the
idling screw T and finally the H jet screw.
The recommended engine speeds are as follows:
Model
Max revs
Idle revs
340
345
12,500 rpm
12,500 rpm
14,200 rpm
13,000 rpm
13,000 rpm
13,000 rpm
13,000 rpm
2,700 rpm
2,700 rpm
2,700 rpm
2,700 rpm
2,700 rpm
2,700 rpm
2,700 rpm
346XP/G
350
350
351
353
EPA
The L and H jets adjust the fuel flow to match
the airflow that the throttle valve opening allows.
Turning them clockwise makes the fuel/air mixture
weaker (less fuel in relation to the amount of air)
Basic requirements
and turning them anti-clockwise makes the fuel/air • Before making any adjustments the air filter
mixture richer. A weak mixture increases the
engine speed and a rich mixture decreases the
engine speed.
should be clean and the cylinder cover should be
in place. If the carburettor is adjusted with a dirty
air filter, the mixture will be too weak next time
the air filter is cleaned. This can cause serious
engine damage.
The T screw controls the throttle position when
idling. Turning the T screw clockwise gives faster
idling; turning it anti-clockwise lowers idling speed.
•
Carefully screw in the L and H jets fully, then
back them off 1 turn. The carburettor now has the
settings H = 1 and L = 1.
WARNING!
•
•
Start the chainsaw and allow it to warm up for 10
minutes.
The guide bar, chain and clutch
cover must be fitted before the
saw is started, otherwise the
clutch may fly off and cause in-
jury.
Place the saw on a flat surface so that the guide
bar is pointing away from you and the guide bar
and chain are not touching the surface.
Basic settings and running in
Low speed jet L
During testing at the factory the carburettor is
adjusted to the basic factory settings.
The factory settings are H = 1 turn and L = 1
turn.
•
Find the highest idling speed by slowly screwing
the L screw in and then out again.
•
When the highest speed has been found, screw
out the L screw 1/8 - 1/4 turn.
To ensure that engine components receive
adequate lubrication (running in) the carburet-
tor should be set to a somewhat richer fuel
mixture for the chainsaw’s first 3-4 running
hours. This is done by adjusting the maximum
speed to 6-700 rpm less than the recommend-
ed maximum speed.
English – 38
| Categories | Chainsaw Manuals, Husqvarna Chainsaw Manuals |
|---|---|
| Tags | Husqvarna 340, Husqvarna 345, Husqvarna 346XP, Husqvarna 350, Husqvarna 351, Husqvarna 353 |
| Model Year | 2003, 2004, 2005, 2006 |
| 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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