36 – English
Basic settings and running in
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.
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 recommended
maximum speed.
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.
The recommended maximum speed must not
be exceeded.
Carburettor – adjustment
For instructions on adjusting the EPA carburettor
see appendix A.
Adjusting the carburettor involves adjusting the
engine to the local conditions e.g. climate, altitude,
fuel and type of two-stroke oil.
The carburettor is equipped with three adjustment
options.
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. speed Idling speed
340 12,500 rpm 2,700 rpm
345 12,500 rpm 2,700 rpm
346 XP/G 14,700 rpm 2,700 rpm
350 13,000 rpm 2,700 rpm
351 /G 13,000 rpm 2,700 rpm
Repair instructions
NOTE!
If the chain turns at idling speed, the T
screw should be turned anti-clockwise
until the chain stops.
WARNING!
The guide bar, chain and clutch
cover must be fitted before the
saw is started, otherwise the
clutch may fly off and cause injury.
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)
and turning them anti-clockwise makes the fuel/air
mixture richer. A weak mixture increases the
engine speed and a rich mixture decreases the
engine speed.
The T screw controls the throttle position when
idling. Turning the T screw clockwise gives faster
idling; turning it anti-clockwise lowers idling speed.
!
V-bok 340-351 Eng 99-04-15, 18.4636
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