Husqvarna 142RB manual Maintenance, Carburettor, Muffler, Operation, Idle speed adjustment T

MAINTENANCE

Carburettor

Your Husqvarna product has been designed and manufac- tured to specifications that reduce harmful emissions. After your unit has been run 8-10 tanks of fuel the engine has broken in. To ensure that your unit is at peak perform- ance and producing the least amount of harmful emissions after break in, have your authorized servicing dealer, who has a revolution counter at his disposal, to adjust your carburet- tor for optimum operating conditions.

!WARNING!

The complete clutch cover with shaft must be fitted before the machine is started, otherwise the clutch can become loose and cause personal injury.

Operation

•The carburettor governs the engine‘s speed via the throttle. Air/fuel is mixed in the carburettor. The air/fuel mixture is adjustable. To take advantage of the engine‘s optimal output the adjustment must be correct.

•The setting of the carburettor means that the engine is adapted to local conditions, for example, the climate, altitude, petrol and the type of 2-stroke oil.

Muffler

NOTE!

Some mufflers are fitted with a catalytic converter. See “Techni- cal data” to see whether you brush cutter is fitted with a catalytic converter.

The muffler is designed to dampen the noise level and to direct the exhaust fumes away from the user. The exhaust fumes are hot and can contain sparks, which can result in fire if the exhaust fumes are directed towards a dry and inflamma- ble material. Some mufflers are equipped with a special spark arrestor 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

Idle speed adjustment (T)

•Check that the air filter is clean. When the idle speed is correct, the trimmerhead will not rotate. If adjustment is required, close (clockwise) the T-screw, with the engine running, until the trimmerhead starts to rotate (3 400 rpm). Open (counterclockwise) the screw until the trimmerhead stops. You have reached the correct idle speed (abt 2 600 rpm) when the engine runs smoothly in all positions well below the rpm when the trimmerhead starts to rotate.

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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. Contact your dealer to inspect the muffler. A blocked screen will cause the engine to overheat resulting in damage to the cylinder and piston. Also see under “Maintenance”.

NOTE! Never use a machine with a defective muffler.

!WARNING!

Contact your servicing dealer, if the idle speed setting cannot be adjusted so that the cutting attachment stops. Do not use the machine until it has been properly adjusted or repaired.

NOTE!

The machine should only be used for short periods at its highest speed.

English – 19