Husqvarna 250 R ユーザーズマニュアル

32 – 

English

The machine is equipped with fixed L and H-needles, in order 
to ensure that the machine always receives the correct 
mixture of fuel and air.

When the engine lacks power or accelerates poorly, proceed 
as follows:

•

Check the air filter and replace if necessary.

•

When this does not help, contact an authorised service 
workshop. The needles are available in different sizes.

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.

When the carburetor is correctly adjusted the machine will 
accelerate without hesitation and burble a little at maximum 
speed. It is also important that the cutting attachment does 
not rotate at idle. 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.

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.