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30 – English
MAINTENANCE
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.
CAUTION! If the chain rotates while idling the T-screw
must be turned anti-clockwise until the chain stops.
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
At the factory the engine is adjusted at sea level. When
working at a high altitude or in different weather
conditions, temperatures and atmospheric humidity, it
may be necessary to make minor adjustments to the high
speed jet.
CAUTION! If the high speed jet is screwed in too far, it
may damage the piston/cylinder.
When test run at the factory, the high speed jet is set so that
the engine satisfies the applicable legal requirements at the
same time as achieving maximum performance. The
carburettor’s high speed jet is then locked using a limiter cap
in the fully screwed out position. The limiter cap limits the
potential to adjust the high speed jet to at most half a turn.
CAUTION! There is an integrated speed governor in the
ignition system that limits the maximum speed to 13600 rpm.
The maximum speed will not exceed 13600 rpm when the
high speed jet is adjusted (screwed in). When the speed
governor is activated, you will get the same sound experience
as when the chain saw 4-cycles.
To adjust the carburettor correctly you should contact a
mechanic with access to a rev counter.
CAUTION! As the spark is cut off, the rev counter does not
show speeds higher than 13600 rpm.
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.
Carburettor without movement
limiters
Function, Basic settings, Fine adjustment
Function
• The carburettor governs the engine’s speed via the
throttle control. Air and fuel are mixed in the carburettor.
The air/fuel mixture is adjustable. Correct adjustment is
essential to get the best performance from the machine.
• Adjusting the carburettor means that the engine is
adapted to local operating conditions, e.g. climate,
altitude, petrol and the type of 2-stroke oil.
• The carburettor has three adjustment controls:
- L = Low speed jet
- H = High speed jet
- T = Idle adjustment screw
• 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.
Basic settings and running in
The basic carburettor settings are adjusted during testing at
the factory. The basic settings are H = 1 turn and L = 1 turn.
To provide the engine’s components with good initial
lubrication (during running in) the carburettor should be set for
a richer fuel mixture for the first 3-4 hours that the chain saw
is in use. To do this, adjust the fast idle speed to 600-700 rpm
below the recommended maximum fast idle speed.
If you are unable to check the fast idle speed using a
tachometer the H-jet should not be set for a leaner mixture
than given in the basic settings. The recommended maximum
fast idle speed must not be exceeded. CAUTION! If the
chain rotates while idling the T-screw must be turned anti-
clockwise until the chain stops.
!
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.
!
WARNING! Do not start the chain saw unless
the bar, chain and clutch cover (chain brake)
are fitted, otherwise the clutch may come
loose and cause personal injury.
H
L
L
H
T