Husqvarna 1153176-26 用户手册

30 – English

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.

Fine tuning may be required if the chain saw, after 
changing the type of fuel, performs differently with regard 
to starting, acceleration, maximum speed, etc.

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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.

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Do not attempt to adjust the L and H jets beyond either 
stop as this could cause damage.

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Now start the machine according to the starting 
instructions and let it warm up for 10 minutes. 
CAUTION!  If the chain rotates while idling the T-
screw must be turned anti-clockwise until the 
chain stops.

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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.

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.

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.

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 13000 
rpm. The maximum speed will not exceed 13000 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 13000 rpm.

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.

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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.

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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.