Husqvarna 340, 345, 346XP,350, 351, 353 Ignition module testing, Ignition module/flywheel removal

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Repair instructions

Ignition module – testing

If there is a fault in the ignition system the ignition module must be tested before the ignition system is removed.

Test the ignition module as follows:

•Connect a test spark plug 502 71 13-01 to the ignition lead and clip the test spark plug onto the cylinder.

•Turn the engine over using the starter cord.

•If the test spark plug produces a spark the ignition module is OK.

Ignition module/flywheel – removal

1

Remove the cylinder cover. Disconnect the HT lead, remove the spark plug and fit piston stop 502 54 15- 01 in its place. Take off the starter assembly, release the leads from the cable guide and remove it.

Model 346XP, 351, 353:

Remove the cover from the hand grip.

2

If replacing the ignition module, disconnect its leads and unscrew it. The ignition module can be left in place if you are simply removing the flywheel.

3

Loosen the flywheel nut using a suitable socket and unscrew it until it is flush with the end of the shaft.

4

Position puller 504 90 90-02 over the magnets and counterweight on the flywheel. Tighten 2–3 turns and tap the head of the puller with a metal mallet to release the flywheel. Remove the puller, nut and washer. Lift off the flywheel.

Cleaning and inspection

•Clean all parts, especially the tapers on the flywheel and shaft.

•Check that the flywheel is not cracked or dam- aged in any other way.

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Contents 340 345 346XP 350 351 Workshop manual Husqvarna 340/345/346XP/350/351/353 Contents Appendix A, Carburettor EPA modelsTroubleshooting IntroductionArrangement of the manual Construction and functionSafety regulations General instructionsSpecial instructions Special tools 20 b 20 c 20 aTechnical data Rpm Construction and function CarburettorConstruction and function Troubleshooting StartingIdling low rpm High rpm Acceleration and retardationCleaning and inspection Repair instructionsChain brake dismantling Chain brake reassembly Operating testChain catcher replacement Silencer removalSilencer refitting RefitStop switch removal Stop switch resistance measurementStop switch refitting Choke control removalChoke control refitting Throttle lock, throttle trigger and return spring removalThrottle lock, throttle trigger and return spring refitting Generator troubleshooting Switch troubleshootingHand grip heater on model 346XPG, 351G, 353G removal Troubleshooting carburettor heater 346XPG, 351G, 353G Heater element and rear hand grip removal Hand grip heater on model 346XPG, 351G, 353G refittingStarter assembly removal Replacing a broken or worn starter cordStarter assembly refitting Tensioning the recoil springReplacing a worn recoil spring Ignition module testing Ignition module/flywheel removalModel 346XP, 351 Replacing the generator, model 346XP, 351 Generator refittingIgnition module and flywheel refitting Inspection and cleaning Centrifugal clutch removalCentrifugal clutch refitting Oil pump removal 346XP, 350, 351 ModelOil pump removal 340 Oil pump -refitting 346XP, 350, 351Oil pump -refitting 340 Adjustable oil pump adjustment 346XP, 350, 351 Carburettor removalCarburettor dismantling On saws with a carburettor heater 346XPG, 351G, 353GCarburettor reassembly Carburettor pressure testing Carburettor refittingOn saws with a carburettor heater 346XPG, 351G, 353G Carburettor heater 346XP, 351, 353 Refitting Air intake system removal Air intake system refitting Carburettor adjustment Basic requirementsLow speed jet L Fine adjustment of idling speed T Carburettor correct adjustmentFuel tank removal High speed jet HReplacing the fuel filter Replacing the fuel hoseTank vent testing Fuel tank refittingPiston and cylinder removal Models 340If replacing the cylinder Decompression valve pressure testing Piston and cylinder refitting 346XP, 350, 351 Cylinder pressure testing Piston and cylinder refitting 340Crankcase and crankshaft dismantling 346XP, 351 Crankshaft bearings replacement 346XP, 351 Sealing ring replacementSealing ring replacement drive side Crankshaft complete dismantling 340, 345Crankshaft bearings 340, 345, 350 replacement Crankcase and crankshaft reassembly 346XP, 351Take care to avoid damaging the crank- case Crankshaft complete 340, 345, 350 reassembly Repairing damaged threads Guide bar bolts replacementThread insert Basic adjustment for EPA II carburetors Replacement of the L-needleCheck that H-needle must not rotate114 01 2003W12

340, 345, 346XP,350, 351, 353 specifications

Husqvarna is renowned for its high-quality chainsaws, and the Husqvarna 340, 345, 346XP, 350, 351, and 353 models are no exceptions. These models have garnered a reputation among both professional and amateur users for their reliability, durability, and cutting performance.

The Husqvarna 340 is an entry-level model designed for homeowners and light-duty tasks. It features a 40cc engine that provides a good balance of power and weight, making it easy to handle during extended use. The 340 is equipped with low-vibration technology, significantly reducing operator fatigue and making it suitable for less experienced users.

The Husqvarna 345 is slightly more powerful than the 340, boasting a 45.7cc engine. This model is ideal for users who require a bit more power for medium-duty tasks. It incorporates the air injection system, which helps to separate larger debris before it reaches the air filter, prolonging the life of the filter and maintaining optimal performance.

Moving up the range, the Husqvarna 346XP is a powerful professional chainsaw tailored for demanding tasks. With a 50.2cc engine and the X-Torq engine technology, it provides high cutting performance while reducing fuel consumption and emissions. The 346XP features an adjustable oil pump that allows for precise lubrication, making it an excellent choice for commercial users.

The Husqvarna 350 shares similarities with the 346XP but is designed for users who need a well-rounded saw for various applications. Its 50.2cc engine delivers ample power, and the ergonomically designed handle provides comfort during prolonged use. The chainsaw's advanced starting system ensures easy ignition, even in challenging conditions.

The 351 is another versatile option, equipped with a 50cc engine, designed for both professional and home use. It emphasizes user comfort and ease of handling. The compact design combined with features such as an efficient air filtration system makes the 351 suitable for long hours of work.

Lastly, the Husqvarna 353 is a heavy-duty model that excels in performance and longevity. It has a 50cc engine and incorporates various safety features, including a chain brake and throttle lock, to ensure safe operation. The saw also utilizes the unique anti-vibration system, minimizing vibrations that can lead to user fatigue.

In summary, the Husqvarna 340, 345, 346XP, 350, 351, and 353 models each offer distinct features catering to a wide range of users. From homeowners tackling light tasks to professionals requiring rugged performance, these chainsaws showcase Husqvarna's commitment to quality, innovation, and user-centric design.
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