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32 – English
Fine adjustment
When the machine has been ”run-in” the carburettor
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.
The recommended engine speeds are as follows:
Conditions
• Before any adjustments are made the air filter should
be clean and the cylinder cover fitted. Adjusting the
carburettor while a dirty air filter is in use will result in
a leaner mixture next time the filter is cleaned. This
can give rise to serious engine damage.
• Carefully turn the L and H-jets clockwise as far as they
will go
. Now turn the jets one turn anti-clockwise. The
carburettor is now set to H = 1 and L = 1.
• Now start the machine according to the starting
instructions and let it w
arm up for 10 minutes.
• Place the machine on a flat surface so that the bar
points away from you and so that the bar and chain do
not come into contact with the surface or other
objects.
Low speed jet L
Turn the low speed jet L clockwise until it stops. If the
engine accelerates poorly or idles unevenly, turn the low
speed jet L anticlockwise until good acceleration and
idling are achieved.
Fine adjustment of the idle speed T
Adjust the idle speed with the T-screw. If it is necessary to
re-adjust, turn the T-screw clockwise while the engine is
running, until the chain starts to rotate. Then turn anti-
clockwise until the chain stops. When the idle speed is
correctly adjusted the engine should run smoothly in
every position and the engine speed should be safely
below the speed at which the chain starts to rotate.
High speed jet H
• The high speed jet H influences the power and engine
speed of the machine. If the high speed jet is set too
rich (H-jet screwed in too far) the machine will over-rev
and this will damage the engine. Run the machine at
full throttle for about 10 seconds. Then turn the H-jet
1/4 turn anti-clockwise. Run the machine at full throttle
for another 10 seconds or so and listen to the
difference in the fast idle speed. Repeat this
procedure with the H-jet turned a further 1/4 turn anti-
clockwise.
• You have now run the machine at settings of H =
±0,
H=+1/4, H=+1/2 relative to the basic settings. At full
throttle the engine has sounded different for each
setting. The H-jet is correctly adjusted when the
machine burbles a little. If the machine ”screams” then
the machine is set too lean. If the muffler emits a lot of
smoke and the machine burbles a lot then the setting
is too rich. Turn the H-jet clockwise until the setting
sounds right
CAUTION! To ensure correct adjustment you should enlist
a qualified mechanic who has access to a tachometer
.
The recommended maximum fast idle speed must not be
exceeded.
Correctly adjusted carburettor
When the carburettor is correctly adjusted the machine
accelerates without hesitation and 4-cycles a little at full
throttle. It is also important that the chain does not rotate
at idle. If the L-jet is set too lean it may cause starting
difficulties and poor acceleration. If the H-jet is set too
lean the machine will have less power, poor acceleration
and could suffer damage to the engine.
If both the L and H jets are set too rich it will results in
acceler
ation prob
lems or too low a working speed.
Max. fast idle speed,
rpm
Idle speed, rpm
357XP
14000 2700
359 13500 2700
!
WARNING! Contact your servicing
dealer, if the idle speed setting cannot be
adjusted so that the chain stops. Do not
use the chain saw until it has been
properly adjusted or repaired.
L
+ 1/4
H