HUSQVARNA 143R
Owner's Manual

MAINTENANCE
Carburettor
Your Husqvarna product has been designed and manufactured to speci�cations 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. WARNING! The complete clutch cover and shaft must be �tted before the machine is started, otherwise the clutch can come loose and cause personal injury.

Muf�er

CAUTION! Some muf�ers are �tted with a catalytic converter. See chapter on Technical data to see whether your machine is �tted with a catalytic converter. The muf�er 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 �re if directed against dry and combustible material.

!

Function

�

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.

�

Adjusting the idle speed (T)
Check that the air �lter 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.

Some muf�ers are equipped with a special spark arrestor mesh. If your machine has this type of muf�er, you should clean the mesh at least once a week. This is best done with a wire brush. On muf�ers without a catalytic converter the mesh should be cleaned weekly, or replaced if necessary. On muf�ers �tted 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 muf�er. 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 muf�er. WARNING! Muf�ers �tted with catalytic converters get very hot during use and remain so for some time after stopping. This also applies at idle speed. Contact can result in burns to the skin. Remember the risk of �re!

!

+ -

Cooling system

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

4 1
Note: The machine should only be run for short periods at its highest speed. WARNING! 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.

3

2
The cooling system consists of: 1 2 3 4 Air intake on the starter. Fins on the �ywheel. Cooling �ns on the cylinder. 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.

22 � English