31
English
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MAINTENANCE
Low speed needle L
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.
CAUTION!
If the saw blade rotates while the motor is
running at idling speed, the T-screw must
be turned counter-clockwise until the saw
blade stops moving.
Final setting of the idling speed T
Adjust the idling speed with the screw T. If it is
necessary to re-adjust, first turn the idle speed
adjusting screw T clockwise, until the chain starts to
rotate. Then turn, counter-clockwise until the chain
stops. A correctly adjusted idle speed setting occurs
when the engine runs smoothly in every position. It
should also be good margin to the rpm when the
chain starts to rotate.
WARNING!
Contact your servicing dealer, if
the idle speed setting cannot be
adjusted so that the chain stops.
Do not use the saw until it has
been properly adjusted or repai-
red.
L
+ 1/4
H
High speed needle H
The high speed needle H influences the power of
the saw. A too lean adjusted high speed needle H
(high speed needle H closed too much) gives
overrevs and damages the engine. Let the saw run
at full speed for about 10 seconds. Thereafter, turn
the high speed needle H 1/4 turn counter-clockwise.
Let the saw run again at full
speed for about 10 seconds and note the difference
of the enginesound. Repeat this procedure with the
high speed needle H turned 1/4 turn more counter-
clockwise. The saw has now been tested with the
following settings: H=±0, H=+1/4, H=+1/2 from
basic adjustment. At full speed the engine has
produced a different sound for each setting. The
high speed needle H is correctly set when the saw
”4-cycles” a little. If the saw ”whistles” the setting is
too lean. If there is too much exhaust gas at the
same time as the saw ”4-cycles” much, the setting
is too rich. Turn the high speed needle H until the
setting sounds correct.
NOTE! For optimum setting of the
carburettor, contact a qualified servicing
dealer who has a revolution counter at his
disposal. The maximum speed
recommended must not be exceeded.
Correctly adjusted carburettor
A correctly adjusted carburettor means that the
saw accelerates without hesitation and the saw 4-
cycles a little at max speed. Furthermore, the chain
must not rotate at idling. A too lean adjusted low
speed needle L may cause starting difficulties and
bad acceleration.
A too lean adjusted high speed needle H gives
lower power=less capacity, bad acceleration and/
or damage to the engine.
A too rich adjustment of the two speed needles L
and H gives acceleration problems or too low
working speed.
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