Husqvarna 325HE4X-Series ユーザーズマニュアル

18 – 

English

Adjust the idle speed with the idle adjustment screw T, if 
adjustment is necessary. First turn the idle adjustment screw 
T clockwise until the blades start to move. Then turn the idle 
adjustment screw T anticlockwise until the blades stop. The 
idle speed is correctly adjusted when the engine runs 
smoothly in every position. There should also be a clear 
margin to the speed at which the blades start to move.

The blades must also remain stationary when the choke 
control is in the start throttle position.

IMPORTANT! If the idle speed cannot be adjusted so that the 
cutting attachment stops, contact your dealer/service 
workshop. Do not use the machine until it has been correctly 
adjusted or repaired.

The high speed jet H affects the engine power, speed, 
temperature and fuel consumption. If the high speed jet H is 
set too lean (screwed in too far) the engine speed will be too 
high and cause engine damage. Do not let the engine run at 
full speed for more than 10 seconds.

Apply full throttle and turn the high speed jet H very slowly 
clockwise until the engine slows down. Then turn the high 
speed jet H very slowly anticlockwise until the engine starts to 
run unevenly. Now turn the high speed jet H slowly clockwise 
a little way until the engine runs smoothly. 

Note that the engine should not be under load when you 
adjust the high speed jet H. You should therefore remove the 
cutting attachment, nut, support flange and drive disc before 
adjusting the high speed jet H. The high speed jet H is 
adjusted correctly when the machine burbles a little. If the 
machine races then the setting is too lean. If the engine 
produces a lot of smoke and burbles a lot then the setting is 
too rich.

CAUTION!  For optimum adjustment of the carburettor, 
contact a qualified dealer/service workshop that has a 
revolution counter at their disposal. 

When the carburettor is correctly adjusted the machine 
accelerates without hesitation and burbles a little at maximum 
speed. It is also important that the blades do not move when 
the engine is idling or when the choke control is in the start 
position. If the low speed jet L is set too lean it may cause 
starting difficulties and poor acceleration.

If the high speed jet H is set too lean it will result in less power, 
less performance, poor acceleration and/or 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.

CAUTION!  Some mufflers are fitted with a catalytic 
converter. See chapter on Technical data to see whether your 
machine is fitted with a catalytic converter.

The muffler is designed to reduce the noise level and to direct 
the exhaust gases away from the operator. The exhaust 
gases are hot and can contain sparks, which may cause fire 
if directed against dry and combustible material.

Some mufflers are equipped with a special spark arrestor 
mesh. If your machine has this type of muffler, you should 
clean the mesh at least once a week. This is best done with a 
wire brush.

On mufflers without a catalytic converter the mesh should be 
cleaned weekly, or replaced if necessary. On mufflers fitted 
with a catalytic converter the mesh should be checked, and if 
necessary cleaned, monthly. If the mesh is damaged it 
should be replaced. If the mesh is frequently blocked, this 
can be a sign that the performance of the catalytic converter 
is impaired. Contact your dealer to inspect the muffler. A 
blocked mesh will cause the machine to overheat and result 
in damage to the cylinder and piston. See also instructions 
under the heading Maintenance.

CAUTION!  Never use a machine with a defective muffler.

H