Maintenance; General; Carburetor Adjustment; Low Speed Jet L - Husqvarna 362XP Operator's Manual

General

The user must only carry out the maintenance and service
work described in this manual.
IMPORTANT! Any maintenance other than that described in
this manual must be carried out by your servicing dealer
(retailer).

Carburetor adjustment

Due to existing environmental and emissions legislation your
chain saw is equipped with movement limiters on the
carburetor adjuster screws. These limit the adjustment
possibilities to a maximum of a 1/2 turn.
H
L
1/2
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful emissions.
Function
• The carburetor governs the engine's speed via the throttle
control. Air and fuel are mixed in the carburetor. The air/
fuel mixture is adjustable. Correct adjustment is essential
to get the best performance from the machine.
• The setting of the carburetor means that the engine is
adapted to local conditions, for example, the climate,
altitude, fuel and the type of 2-stroke oil.
• The carburetor has three adjustment controls:
- L = Low speed jet
- H = High speed jet
- T = Idle adjustment screw
H
T
L
• The L and H-jets are used to adjust the supply of fuel to match
the rate that air is admitted, which is controlled with the throttle.
If they are screwed clockwise the air/fuel ratio becomes leaner
(less fuel) and if they are turned anti-clockwise the ratio
becomes richer (more fuel). A lean mixture gives a higher
engine speed and a rich mixture gives a lower engine speed.
• 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 carburetor settings are adjusted during testing at
the factory. Avoid running at a too high speed for extended
periods during the first 10 hours.
CAUTION! If the chain rotates while idling the T-screw
must be turned anti-clockwise until the chain stops.
Rec. idle speed: 2700 rpm

MAINTENANCE

1/2
Fine adjustment
When the machine has been "run-in" the carburetor 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.
Conditions
• Before any adjustments are made the air filter should be clean
and the cylinder cover fitted. Adjusting the carburetor 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.
• Do not attempt to adjust the L and H jets beyond
either stop as this could cause damage.
• Now start the machine according to the starting
instructions and let it warm 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 idling 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 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 chain
saw until it has been properly adjusted or
repaired.
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
carburetor'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 carburetor 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.
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English