Husqvarna 327RJx manual Maintenance, Carburetor

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MAINTENANCE

Carburetor

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.

WARNING! The complete clutch cover

! and shaft must be fitted before the machine is started, otherwise the clutch can come loose and cause personal injury.

Function

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

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

The carburetor 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 carburetor 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.

Rec. idle speed: 2700 rpm

Recommended max. 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.

Fine adjustment

When the machine has been ”run-in” the carburetor should be finely adjusted. The fine adjustment should be carried out by a qualified person. First adjust the L-jet, then the idling screw T and then the H-jet.

Conditions

Before any adjustments are made, make sure that the air filter is clean and the air filter cover is fitted. If you adjust the carburettor when the air filter is dirty it will result in a leaner mixture when the filter is finally cleaned. This can lead to serious engine damage.

Carefully turn both jets, L and H, so that they are midway between fully screwed in and fully screwed out.

Do not attempt to adjust the L and H jets beyond either stop as this could cause damage.

Now start the machine according to the starting instructions and let it warm up for 10 minutes.

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.

English 21

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Contents 327RJX-series Symbols KEY to SymbolsOperator of the machine must Ensure, while working, that no Persons or animals come closerContents Dear customer IntroductionWhat is what on the trimmer? What is WHAT?Personal protective equipment General Safety PrecautionsThrottle lockout Machine′s safety equipmentCutting attachment guard Stop switchVibration damping system MufflerLocking nut Cutting equipment Cutting equipmentSharpening grass cutters and grass blades General rulesTrimmer head Assembly Fitting the J-handleAssembling the cutting equipment Fitting other guards and cutting attachments Fuel safety Fuel HandlingFuel Mixing FuelingCheck before starting Starting and StoppingStarting and stopping StartingStarter cord around your hand StoppingBasic safety rules Working TechniquesGeneral working instructions Basic working techniques Grass clearing using a grass bladeGrass trimming with a trimmer head TrimmingSweeping CuttingCarburetor MaintenanceCorrectly adjusted carburetor Fine adjustment of the idle speed TLow speed jet L High speed jet HCooling system MufflerSpark plug Screen is damaged it should be replacedAir filter Cleaning the air filterBevel gear Oiling the air filterMaintenance Daily Weekly Monthly Maintenance scheduleTechnical data Technical DataYour Warranty Rights and Obligations Emission Warranty Parts List Page S35 2,7mm 095-.106 25 m 15 cm T35, T35x T25 Page Page 1150990-95