Jonsered BC2053 用户手册

English

 – 21

Check that the air filter is clean. When the idle speed is 
correct, the cutting attachment should not rotate. If 
adjustment is required, close (turn clockwise) the idle 
adjustment screw T, with the engine running, until the cutting 
attachment starts to rotate. Open (turn anticlockwise) the 
screw until the cutting attachment stops. The idle speed is 
correctly set when the engine runs smoothly in all positions, 
and there is a clear margin to the speed at which the cutting 
attachment starts to rotate.

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.

CAUTION!  Never use a machine with a defective muffler.

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 air filter must be regularly cleaned to remove dust and dirt 
in order to avoid:

•

Carburettor malfunctions

•

Starting problems

•

Loss of engine power

•

Unnecessary wear to engine parts.