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

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Fuel system

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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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Contents English Model 343R, 345RX, 343F, 345FX, 345FXT Contents Workshop Manual Brushcutter, TrimmerGeneral recommendations Contents Starter1Starter DismantlingAssembly StarterReplacing the drive dogs Electrical system Electrical system Checking the ignition spark502 71 Tip Replacing the spark Plug cover 502 50502 54 Drive dogs Heated handlesWiring diagram Electrical system Fuel system Fuel system Air filterTank venting Fuel filterFuel pump CarburettorDismantling Carburettor’s design Metering unitBlending unit Pump unit Dismantling the carburettorFuel system Positioned For example, the H-needle is aLittle shorter than the L-needle Assembling the carburettor H-needle is a little shorter Than the L-needleCheck carefully that the fuel hoses Are not bent or pinched whenCarburettor settings Basic settingFine adjustment Setting Recommended max. speed must not be exceeded Correctly adjusted carburettorTachometer should always be used to find the optimal Idling speed T-screwCarburettor adjustment 345RX/FX Adjusting the L-needle Adjusting the H-needleThrottle RotatingCheck for wear on pins a and B Tip Page Centrifugal clutch Centrifugal clutch 502 21Centrifugal clutch Do not lose the sleeve bearings found in the clutch shoesClutch drum 502 11Change the bearings in the clutch housing if necessary Page Angle gear Angle gear Let the small circlip around the axle remain503 97 Input axle with pinion must be dismantled firstShaft 503 80Cylinder and piston Cylinder and piston Turn the valve the right way when fitting When the valve is fitted the small hole must face outwardsDecompression valve Cleaning, inspection Inlet manifoldAnalysis and actions Insufficient lubricationCause Action Piston scoring caused by heavy carbon deposits Piston damage caused by a too high engine speed Piston ring breakageForeign objects CauseService tips Defect ActionWear tolerances Crankshaft and crankcase Crankshaft and crankcase Crankshaft and crankcase 502 52Inspecting Crankshaft Assembly Leakage testing Crankcase Press down the sealing plates asFar as possible between the bolts To ensure a proper sealHusqvarna E-Tech 503 55