Husqvarna 125BT 用户手册

14 – 

English

Your Husqvarna product has been designed and 
manufactured to specifications that reduce harmful 
emissions. After the engine has used 8-10 tanks of fuel the 
engine will be run-in. To ensure that it continues to run at peak 
performance and to minimise harmful exhaust emissions after 
the running-in period, ask your dealer/service workshop (who 
will have a rev counter at their disposal) to adjust your 
carburettor.

The carburettor governs the engine’s speed via the throttle 
control. Air and fuel are mixed in the carburettor. The air/fuel 
mixture is adjustable. Correct adjustment is essential to get 
the best performance from the machine.

Adjusting the carburettor means that the engine is adapted to 
local operating conditions, e.g. climate, altitude, petrol and the 
type of 2-stroke oil.

Adjust the idle speed using the idle adjustment screw T, if it is 
necessary to readjust.

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. The idle 
speed is correctly adjusted when the engine will run smoothly 
in every position.

Rec. idle speed See the Technical data section.

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 arrest 
screen. If your machine is fitted with this type of screen it 
should be cleaned regularly. This is done using a wire brush. 
On mufflers without a catalytic converter the screen should be 
cleaned weekly, or replaced if necessary. On mufflers fitted 

with a catalytic converter the screen should be checked and 
cleaned monthly. If the screen is damaged it should be 
replaced. If the screen is frequently blocked, this can be a 
sign that the function of the catalytic converter is impaired.

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.