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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Assembling the carburettor, Fuel system

Models: 343R, 345RX, 343F, 345FX, 345FXT

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Fuel system

Assembling the carburettor

Blow the carburettor housing clean. Fit a new plug.

Fit a new main jet.

Assembling the carburettor

•Blow all channels in the carburettor compartment clean

•Mount a new plug.

Use a suitable punch to get a completely tight seal.

•Press in a new main jet.

•Mount the valves and dampers.

Tip!

Any numbers on the valves should be able to be read from the outside.

Replace the fuel screen if it is damaged or cannot be cleaned.

Place the pump diaphragm closest to the carburettor housing. Then the gasket and cover and the other compo- nents in reverse order of removal.

NOTE!

Check that the valves are turned correctly and that they close completely and tightly in the closed position.

Use Loctite on the valve screws.

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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Assembling the carburettor, Use Loctite on the valve screws, Fuel system

Contents

English 343R 345RX 343F 345FX 345FXTWorkshop manual Model 343R, 345RX, 343F, 345FX, 345FXT Contents General recommendations ___________________1.Starter __________________________________ 2.Electrical system _________________________General recommendations RememberSpecial tools Fire riskContents 1 Starter1Starter DismantlingDismantling Assembly StarterAssembly Replacing the drive dogs 1StarterReplacing the drive dogs Electrical system ContentsAssembly _________________________________ Checking the ignition spark ____________________Electrical system Checking the ignition spark502 71 Checking the ignition sparkElectrical system Replacing the spark plug cover502 50 Electrical system502 54 Electrical systemDismantling DismantlingDrive dogs Heated handlesDo not pry off the heating element before the locking catch has beenWiring diagram Electrical systemElectrical system Fuel system ContentsAssembly _________________________________ Carburettor settings _________________________Fuel system Air filterAir filter Tank venting Fuel filterMassage the oil into the air filter Fuel systemFuel pump CarburettorDismantling Fuel systemThe carburettor’s design The metering unitThe blending unit Fuel systemThe pump unit Dismantling the carburettorFuel system The pump unitFuel system In the event of leakage – remove the needle valveNote how the jets are positionedFor example, the H-needleis a little shorter than the L-needleAssembling the carburettor Use Loctite on the valve screwsFuel system Assembling the carburettorare not bent or pinched when the The H-needleis a little shorterthan the L-needle Check carefully that the fuel hosesCarburettor settings Basic settingFine adjustment Functionsetting Correctly adjusted carburettorThe recommended max. speed must not be exceeded Idling speed T-screwCarburettor adjustment 345RX/FX adjustment 345RX/FXAdjusting the L-needle Adjusting the HCheck for wear on pins A and B Fuel systemDisassemble the throttle control A, the lock to prevent accidental throttle operation B, the start throttle lock C and the throttle stop D in order to check if replacement is necessary Fuel systemPage 4 Centrifugal clutch ContentsAssembly _________________________________ Dismantling ________________________________Centrifugal clutch 502 21Dismantling DismantlingCentrifugal clutch 502 54Clutch drum 502 11Assembly AssemblyChange the bearings in the clutch housing if necessary Centrifugal clutchPage 5 Angle gear ContentsAssembly _________________________________ Dismantling ________________________________Angle gear Let the small circlip around the axle remainDismantling Dismantling503 97 AssemblyAngle gear Shaft 503 80Angle gear Shaft6 Cylinder and piston ContentsCleaning, inspection _________________________ Assembly _________________________________Cylinder and piston DismantlingTurn the valve the right way when fitting Decompression valveCylinder and piston Decompression valveCleaning, inspection manifold is fitted using aInlet manifold Exercise caution if the inletAnalysis and actions Insufficient lubricationCause ActionPiston scoring caused by heavy carbon deposits Cylinder and pistonCause ActionPiston damage caused by a too high engine speed Piston ring breakagePiston ring guide pin Damage caused byForeign objects Cylinder and pistonCause ActionService tips DefectBe careful with the lower edge of the piston ring groove. If this is damaged, or if carbon depositsWear tolerances Cylinder borePiston ring gap Piston ring groove7 Crankshaft and crankcase ContentsAssembly _________________________________ Leakage testing the crankcase _________________Crankshaft and crankcase DismantlingDismantling Crankshaft and crankcase 502 52Inspecting the crankshaftCrankshaft and crankcase Inspecting theAssembly AssemblyCrankshaft and crankcase 502 50Leakage testing the crankcasePress down the sealing plates as far as possible between the boltsHusqvarna E-Tech 503 55Crankshaft and crankcase Page Tools ContentsStarter __________________________________ Electrical system __________________________List of tools 505 38Starter ElectricalList of tools gearCrankshaft Workshop114 01 2003W24