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Husqvarna 335RJx Operator's Manual

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MAINTENANCE

English – 21

Carburettor

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.

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.

• The carburettor has three adjustment controls:

L = Low speed jet

H = High speed jet

T = Idle adjustment screw

• The L and H-jets are used to adjust the supply of fuel

to match the rate that air is admitted, which is

controlled with the throttle. If they are screwed

clockwise the air/fuel ratio becomes leaner (less fuel)

and if they are turned anti-clockwise the ratio

becomes richer (more fuel). A lean mixture gives a

higher engine speed and a rich mixture gives a lower

engine speed.

• 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.

Basic setting

• The basic carburettor settings are adjusted during

testing at the factory. The basic setting is richer than

the optimal setting and should be maintained for the

first few hours the machine is in use. The carburettor

should then be finely adjusted. Fine adjustment

should be carried out by a skilled technician.

CAUTION! If the cutting attachment rotates when the

engine is idling the idle adjustment screw T should be

turned anti-clockwise until the cutting attachment stops.

Adjustment of the idle speed

Before any adjustments are made, make sure that the air

filter is clean and the air filter cover is fitted.

Adjust the idle speed using the idle adjustment screw T, if

it is necessary to readjust. First turn the idle adjustment

screw T clockwise until the cutting attachment starts to

rotate. Then turn the screw anticlockwise until the cutting

attachment stops. The idle speed is correctly adjusted

when the engine will run smoothly in every position. The

idle speed should also be well below the speed at which

the cutting attachment starts to rotate.

Rec. idle speed: See the Technical data section.

Muffler

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

H

L

T

!

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.

T