Husqvarna 235F manual Maintenance, Carburettor

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MAINTENANCE

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.

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.

Adjusting the start throttle speed

The correct start throttle speed is set by means of an adjuster on the rear of the handle next to the cable. Use this screw (4 mm Allen screw) to increase or decrease the start throttle speed.

4 mm

Proceed as follows:

1 Run the machine at idle.

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Contents 235R 235FR Persons or animals come closer than KEY to SymbolsSymbols Operator of the machine must Ensure, while working, that noContents Dear Customer IntroductionWhat is what? What is WHAT?Personal protective equipment General Safety PrecautionsThrottle lockout Machine′s safety equipmentQuick release Stop switchCutting attachment guard Vibration damping systemLocking nut MufflerCutting equipment Cutting equipmentGeneral rules Sharpening the saw blade Sharpening grass cutters and grass bladesTrimmer head Assembly Fitting the handlebarTransport position, handlebar Assembling the cutting equipment Fitting a blade guard, grass blade and grass cutterFitting the blade guard and saw blade AM L Fitting the trimmer guard and trimmer head Trimmy SIIAdjusting the harness and brush cutter Fitting other guards and cutting attachmentsSpreading the load on your shoulders Grass clearing Correct heightCorrect balance Forestry clearingFuel safety Fuel HandlingFuel Mixing FuellingCold engine Starting and StoppingCheck before starting Starting and stoppingStopping Warm engineStarting For throttle handles with a start throttle lockABC of clearing Basic safety rulesWorking Techniques General working instructionsControl the felling direction take advantage of the wind Forestry clearing using a saw blade Trimming Grass clearing using a grass bladeBrush cutting with a saw blade Grass trimming with a trimmer headSweeping CuttingCarburettor MaintenanceMuffler Cooling systemBevel gear Oiling the air filter Cleaning the air filterAir filter Spark plugMaintenance Daily Weekly Monthly Maintenance scheduleTechnical data Technical DataEC-declaration of conformity Applies to Europe only Page S35 2,7mm 095-.106 25 m 15 cm T35, T35x T45, T45x Auto Trimmy SII Page Page Page Page Original instructions 1153284-26
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