Husqvarna 343F, 345FX, 345FXT, 343R, 345RX manual Tip

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Electrical system

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If no spark occurs, disconnect the stop switch.

Replace the switch if necessary

The stop switch can be easily detached with a screwdriver.

Still no spark?

Check the ignition cable’s connection to the spark plug cover.

Still no spark?

Check other cables and connections.

If no spark occurs even now, remove the short-circuit cable from the connec- tion point in the carburettor compart- ment.

If the plug now sparks, the fault is either in the stop switch or the short-circuit cable.

Change the switch as needed and check to see if the cable insulation is damaged.

The stop switch is easily reached when the cover is removed.

Use a screwdriver pinch the switch’s snap fastener inside the throttle.

Still no spark?

Check the spark plug connection.

Remove the spark plug cover and make sure the ignition cable is not damaged. Remove a segment of cable if required to get sufficient contact at the connec- tion coil.

Still no spark?

Check other cables and connections for poor contacts (dirt, corrosion, cable breakage and damaged insulation).

Make sure that the cables are correctly drawn and lie in the cable grooves.

Do not forget to check the cables in the throttle too.

See chapter 3 “Throttle”.

Tip!

Use an Ohmmeter in order to easily check if cable breakage has occurred, due to pinching, for example.

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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 Checking the ignition spark Electrical system502 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 filterCarburettor Fuel pumpDismantling Metering unit Carburettor’s designBlending unit Pump unit Dismantling the carburettorFuel system For example, the H-needle is a PositionedLittle shorter than the L-needle Assembling the carburettor Check carefully that the fuel hoses H-needle is a little shorterThan the L-needle Are not bent or pinched whenBasic setting Carburettor settingsFine adjustment Tachometer should always be used to find the optimal Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Idling speed T-screwThrottle Carburettor adjustment 345RX/FXAdjusting the L-needle Adjusting the H-needle 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 When the valve is fitted the small hole must face outwards Turn the valve the right way when fittingDecompression valve Cleaning, inspection Inlet manifoldInsufficient lubrication Analysis and actionsCause 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 Far as possible between the bolts Leakage testing CrankcasePress down the sealing plates as To ensure a proper sealHusqvarna E-Tech 503 55