Husqvarna 325HD75X 用户手册

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 17

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.

CAUTION!  Never use a machine with a defective muffler 
or exhaust pipe.

To keep the working temperature as low as possible the 
machine is equipped with a cooling system.

The cooling system consists of:

1

Air intake on the starter.

2

Fins on the flywheel.

3

Cooling fins on the cylinder.

4

Cylinder cover (directs cold air over the cylinder).

Clean the cooling system with a brush once a week, more 
often in demanding conditions. A dirty or blocked cooling 
system results in the machine overheating which causes 
damage to the piston and cylinder.

The spark plug condition is influenced by:

•

Incorrect carburettor adjustment.

•

An incorrect fuel mixture (too much or incorrect type of 
oil).

•

A dirty air filter.

These factors cause deposits on the spark plug 
electrodes, which may result in operating problems and 
starting difficulties.

If the machine is low on power, difficult to start or runs 
poorly at idle speed: always check the spark plug first 
before taking any further action. If the spark plug is dirty, 
clean it and check that the electrode gap is 0.5 mm. The 
spark plug should be replaced after about a month in 
operation or earlier if necessary.