Husqvarna 385XP 用户手册

English

 – 31

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.

•

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 warm up for 10 minutes. CAUTION!  
If the chain rotates while idling the T-screw must be 
turned anti-clockwise until the chain stops.

•

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.

Try to find the highest idle speed by turning the low speed jet 
L clockwise then anti-clockwise. When the highest speed has 
been found, turn the low speed jet L 1/4 turn anti-clockwise.

CAUTION!  If the chain rotates while idling the T-screw 
must be turned anti-clockwise until the chain stops.

Adjust the idle speed using the idle adjustment screw T, if it is 
necessary to readjust. First turn the idle adjustment screw T 
clockwise until the cutting attachment starts to rotate. Then 
turn the screw anticlockwise until the cutting attachment stops. 
The idle speed is correctly adjusted when the engine will run 
smoothly in every position. The idle speed should also be well 
below the speed at which the cutting attachment starts to 
rotate.

•

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.

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 
acceleration problems or too low a working speed.

Brush off any wood dust, resin and dirt from the chain brake and 
clutch drum. Dirt and wear can impair operation of the brake.

Regularly check that the brake band is at least 0.6 mm thick at 
its thinnest point.

12500

2700

13500

2700

L

+ 1/4

Note! All service and repair work on the machine demands 
special training. This is especially true of the machine’s 
safety equipment. If your machine fails any of the checks 
described below we recommend that you take it to your 
service workshop. 

H