No spark on Husqvarna chainsaw

Chainsaws

Identifying and eliminating obvious chainsaw malfunctions.

To determine the reason why the chainsaw does not start or stalls when starting, it is necessary to troubleshoot the tool. The essence of the procedure is to consistently inspect the condition and operation of the main working elements of the saw motor. At this stage, we check:

  • Spark plug present;
  • Fuel supply;
  • Filter status;
  • The operation of the breather of the stalling unit built into the fuel cap;
  • Discharge duct function.

Chainsaw outlet check.

One of the reasons that a chainsaw does not start well may be a clogged exhaust channel or its muffler. At the same time, a drop in power is noted in the process of sawing sawn timber and logs. This is most often due to resinous deposits on the spark arrestor or muffler channel, which are formed during the combustion of a poor-quality mixture of gasoline and oil, which impede the removal of exhaust gases.

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Resonator clogged with carbon deposits can cause poor starting of the gasoline saw.

Eliminate the reason for the poor start of the chainsaw, in this case, you can remove the accumulated combustion products. To do this, perform a number of manipulations:

  • Remove the muffler by unscrewing the screws;
  • Remove the cooling panel and gasket;
  • Remove the spark arrestor;
  • Disassemble the resonator housing;
  • Wash all elements from carbon deposits with a detergent;
  • Let them dry completely;
  • Collect everything in reverse order;

To prevent dust and sand from getting into the cylinder when cleaning the muffler, cover the outlet of the chainsaw engine with a clean rag..

Starter repair

The starter is responsible for starting the unit. Malfunctions indicate the presence of such malfunctions:

  • the spring has burst;
  • the pulley is damaged;
  • the starter rope is damaged.

Procedure for replacing a worn starter cord:

  • the starter is disassembled, the mechanism is removed, having previously unscrewed the screws securing the case to the motor crankcase;
  • the cord is pulled out at a distance of 30 cm through the hole in the pulley;
  • the return spring is set to the neutral position;
  • the central screw is unscrewed, the pulley itself is removed;
  • a new cord is inserted, stretched, while 3 turns are wound on the mechanism and fixed with a screw;
  • then the cord is pulled through the groove in the housing and the starter handle.

The tension of the return spring is carried out by rotating 2 turns clockwise, while taking into account that it is compressed. When replacing a broken part, the spring should pop out after pulling the inner part down.

How to remove and replace the drive sprocket

The movement of the chain along the bus is carried out by a drive sprocket, which is connected to the gearbox. It is an assembly unit rotating due to a bearing. At the end of the bus there is a driven sprocket with the same pitch in relation to the leading one. Therefore, when carrying out repair work, all factors are taken into account: the coincidence of the spline, the presence of bearings, the kinematics of the tool.

When the spline is worn out, the drive sprocket is replaced, otherwise it will not adhere to the chain.

In order to change a part, you must perform the following actions:

  • unscrew the nuts of the tire cover and remove the headset using working tools;
  • remove the air filter;
  • unscrew the saw candle;
  • remove the clutch on the chainsaw;
  • inspect the drum and check the crown;
  • remove the chain saw sprocket;
  • if necessary, replace the broken part with a new one;
  • reassemble all parts in reverse order.

If the process of replacing the sprocket on a Husqvarna chainsaw is difficult, use the services of a specialist..

Checking the condition of the fuel and air filters.

If everything is in order with the fuel quality, the chainsaw engine may not start due to clogged fuel and air filters. To diagnose these elements, it will be necessary to perform a number of manipulations associated with their dismantling..

For the fuel filter:

  • Disconnect the gasoline supply channel from the carburetor;
  • Pump up fuel.

If there is little or no pressure in the branch pipe, disconnect the filter. Before this, free the tank from the mixture and remove the filter element itself. Dismantling is done with a wire hook. A clogged replacement cartridge that causes a poor starting of the chainsaw engine can be cleaned, but it is best to replace it with a new one. When using the tool in dusty conditions, it should be cleaned on a regular basis..

A clogged air filter can cause the chainsaw engine to run erratically, making it stalling or difficult to start. Dust and dirt deposited on the adsorbent material impede the flow of air into the system, make the fuel mixture so rich that it will sometimes be difficult to start the tool.

Checking the air filter is one of the first steps in finding the cause of a poor start.

Care should be taken when removing the air filter, as dust accumulated on the surface of the saw during operation can enter the carburetor. And this is fraught with more expensive repairs. After detaching the cartridge, thoroughly clean it of accumulated dirt and rinse it with the addition of detergent. Dry the element and put it back in place just as carefully..

Why won’t it start and what to do

Among the malfunctions of a Husqvarna chainsaw, a poor engine start is distinguished. The engine is either completely impossible to start, or it does not start well.

There is no definite answer to the question of why the chainsaw does not start. The main assembly unit of the tool is the engine. The following conditions affect the stability of work:

  • mixing fuel;
  • air;
  • the presence of a spark;
  • grease.

A working node is responsible for each factor:

  • for the combustible mixture – carburetor;
  • for air – a cleaning system, in particular, an air filter;
  • for a spark – ignition mechanism and spark plug;
  • lubrication – lubrication system and gasoline.

A common reason that chainsaws will not start is non-compliance with the starting algorithm. The motor unit should only be started after complete assembly of all parts:

The chain brake is always on. In order not to lose control of the instrument, it is impossible to start in the air..

Starting the engine in a cold state is done as follows:

How To Fix A Chainsaw Coil Spark Issue

  • Place the tool on the ground, step with the right foot on the rear handle, with the left hand on the front handle.
  • The saw is stable, the chain is not touching the ground.
  • Take the starter handle with your right hand, pull the cord, and do not twist it around your hand.
  • As soon as the first flash occurs, return the choke lever to its initial position, opening it, and restarting.
  • Gas and release. The lock is deactivated.
  • Transfer the engine to idle speed by quickly turning off the gas limiter.

The warm engine is started in the same sequence, but without opening the damper.

If the start is correct, but the engine does not work, a possible reason is the lack of fuel in the tank, or the fuel chamber of the carburetor is not filled. Check the tank and chamber, fill them with the mixture.

In the event of a malfunction of the ignition system, inspect the candle and check for the presence of a spark on the electrodes. If it is wet (gasoline fills the candle), and the spark is not found, the part is turned inside out, dried or changed. If it is dry, a spark is present, then there are problems in the fuel equipment – clogging, depressurization of the gas intake.

Magneto malfunctions are also confirmed by a weak spark. Despite the operation of the ignition, there may be no flash in the cylinder, while the plug turned out of the cylinder is wet. Remedy – purging the cylinder with open carburetor flaps.

System electrodes are caked or oily. This is removed with a wire brush. The candle is washed, cleaned, letting the gasoline evaporate.

Violation of the gap between the side and center electrodes leads to a poor start. Normal spacing is 0.6-0.7 mm. It is fitted with a hemming method..

If the ceramic insulator surrounding the central candle or the current-carrying conductor is damaged, the wires are replaced.

Determine the availability of fuel and its supply.

First you need to make sure that there is a fuel mixture in the tank of a chainsaw that does not want to start, and it regularly enters the carburetor. With a full tank, we check how the mixture is fed through the gas line. We disconnect the fuel system pipe from the carburetor and try to pump it up. In the case of a complete order, when pumping up, gasoline will be supplied in jerks in accordance with the norms set by the manufacturer. Poor or no fuel supply may result from:

  • The fuel supply channel is clogged;
  • Debris-clogged fuel filter.

Often the reason for a poor start of the chainsaw can be a tank that is too full. In this case, you should pay attention to the presence of smudges under the saw case cover. If present, see the connection of the gasoline feed pipe to the carburetor. Most often, it is squeezed out by pressure when the tank cap is screwed on, which is filled under the very neck, which prevents the engine from starting.

The quality of the fuel mixture can also be one of the reasons why the chainsaw does not start. If, after completing the work, the remaining gasoline is not drained, and the tool is left for long-term storage (more than 2 weeks), then the processes of resinification and polymerization of the components will begin to occur inside the tank. What can cause carbon deposits on the piston, rings and cylinder liner. Therefore, always prepare the mixture only in the required amount before work..

Checking the spark on the spark plug and eliminating the causes.

The first step in looking for reasons why your gasoline saw won’t start is to check the spark on the spark plug. There are many factors that affect the performance of this element. However, the main ones at the initial stage of instrument troubleshooting are:

  • Incorrect carburetor adjustment;
  • The presence of more than it should be, the amount of oil in gasoline;
  • Clogged air filter.

All of them contribute to the formation of carbon deposits on the spark plug electrodes. In 50 cases out of 100, the saws do not start on a cold one due to the absence of a spark due to carbon deposits on the electrodes and their corrosion. As a result, the gap either decreases or increases..

Checking the spark plug with an idle chainsaw

HOW TO – husqvarna 55 / 51 ignition coil plug wire replacement

It is quite easy to check for a spark. This will require:

  • Remove the tip of the high-voltage wire;
  • Unscrew the candle;
  • Put the tip back on;
  • Lean the candle with a skirt against the cylinder;
  • Start with a starter.

If a good spark is observed between the electrodes at the time of starting the engine of the chainsaw, then everything is in order with the ignition unit. If it is not there, then it is worth cleaning the element itself and checking the gap of the electrodes. If necessary, use a special probe to adjust the distance between the contacts.

For candles from different manufacturers, the distance between the electrodes may fluctuate. For some, it may be equal to 0.5 mm. Others have 0.2 mm. Therefore, carefully study the manufacturer’s recommendations..

There may be no spark on the spark plug for other reasons. Of the main faults affecting the poor start of the chainsaw and the unstable operation of the internal combustion engine at idle, from which the tool can stall, the following can be attributed:

  • Overflow of the spark plug channel with fuel;
  • Lack of contact between the high-voltage cradle and the tip of the candle;
  • Failure of the ignition unit.

How to start a cold chainsaw if the spark plug channel is constantly flooding with gasoline? To eliminate the problem while starting the tool, you can use the following algorithm:

  • Unscrew the candle with a special key;
  • Wipe it with a clean and dry cloth;
  • Dry for 20 … 30 minutes;
  • Remove carbon deposits with a file and adjust the gap between the electrodes;
  • Drain the remaining fuel from the spark plug channel and dry it;
  • Collect everything and try to start the mechanism.

As a rule, these measures are enough to start the chainsaw and get the job done. However, this extreme measure does not eliminate the main reason why the engine does not start or stalls – improper operation of the carburetor, which needs fine adjustment..

If there is no spark and poor contact of the high-voltage cradle with the spark plug tip, check the connection. The check can be carried out using a conventional tester. If a defect is found and it is eliminated, the chainsaw should start without any problems.

If the check showed that the contact is reliable, and the saw does not start further, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired and restored. A complete replacement is required here..

Starter repair

The starter is responsible for starting the unit. Malfunctions indicate the presence of such malfunctions:

  • the spring has burst;
  • the pulley is damaged;
  • the starter rope is damaged.

Procedure for replacing a worn starter cord:

  • the starter is disassembled, the mechanism is removed, having previously unscrewed the screws securing the case to the motor crankcase;
  • the cord is pulled out at a distance of 30 cm through the hole in the pulley;
  • the return spring is set to the neutral position;
  • the central screw is unscrewed, the pulley itself is removed;
  • a new cord is inserted, stretched, while 3 turns are wound on the mechanism and fixed with a screw;
  • then the cord is pulled through the groove in the housing and the starter handle.

The tension of the return spring is carried out by rotating 2 turns clockwise, while taking into account that it is compressed. When replacing a broken part, the spring should pop out after pulling the inner part down.

Yaroslav Stembitsky, 37 years old, Zhytomyr region

“The chainsaw did not start after the winter. I pulled the starter for a long time – the hand was tired, but it would not start. Then I guessed to unscrew the candle and check for a spark – it was muffled, there was nothing. He took off the protective cover, looked – the gap is normal. I collected everything, but it won’t start again. The day was digging until I figured out to check the contact on the candle. It turned out that the spring popped out. Why and when – I don’t know. “

Break-in rules

Chainsaw running in is not carried out for a long time in the twentieth. Therefore, after starting the engine, it is necessary to idle for about 5 minutes, then start sawing trees with a diameter of no more than 10 cm at an average speed..

The technological process is carried out according to a cyclical scheme:

  • 1.5 minutes with a minimum load;
  • 20 seconds on XX without her.

After operating the first 25 hours, the unit can reach full power, all rubbing parts are running-in..

During this period, the recommendations must be adhered to:

  • do not overheat the power plant;
  • do not work for a long time at XX;
  • do not load as much as possible;
  • restrain prolonged slipping of the clutch.

After the final running-in, the following work is carried out:

  • inspection of the crank mechanism;
  • cleaning carbon deposits on all parts;
  • checking fasteners;
  • assembly;
  • preparation of a combustible mixture;
  • carburetor adjustment for maximum power under load.

The saw chain also needs a run-in. Attention is paid to its lubrication and tension. The part is pulled so that it can be freely rotated by hand. Lubrication is carried out by immersion in oil. Then the chain is run at XX for 3-5 minutes. The engine is stopped, the chain cools down and only then the tension is checked..

  • disconnect the fuel hose from the carburetor;
  • inspect the fluid leakage – the breather is clean if a full jet comes out.

The next reason why a chainsaw stalls is that the muffler is contaminated with exhaust resins. The issue is resolved by cleaning.

Piston ring wear affects the operation of the cylinder-piston group. If there is a backlash during the check, parts are replaced.

When starting the engine, the unit can also stall:

  • as a result of water entering the mixture;
  • due to poor chain lubrication;
  • oil wire leaks;
  • clogging of channels.

Pay attention to the chain:

  • with increased dryness, the oil supply channels are cleaned, the elements of the connection of the fittings with the pipes are inspected;
  • in case of oil leaks at the connecting points or the presence of cracks in the pipes, seal with a sealant.

The motor does not develop speed:

  • if the piston rings burn in the grooves;
  • with wear and loss of elasticity of rubber crankcase seals;
  • leaks in the connection of the cylinder to the crankcase;
  • due to incorrect setting of the ignition timing;
  • as a result of contamination of the fins of the cylinder and the fan grill;
  • under heavy load immediately after purchasing a new engine.

No spark

The absence of a spark is caused by a complete failure of the spark plug and a poor connection between the tip and the high voltage wire. If no defects are detected when checking the contact, and there is no spark when the starter is turned on, change the electronic ignition system.

How to make sure there is really no spark

To make sure there is a spark on the chainsaw or not, you need to follow a simple procedure:

  • Removing the top cover on the case.
  • Carefully, with a grip at the very bottom, so as not to tear off the candle wire, the cap is removed from the candle.
  • With a 19 socket wrench included in the kit, the candle is unscrewed counterclockwise.
  • The cap is put on in place, on the candle.
  • The thread or nut of the candle is “shorted to ground”, that is, pressed against the metal cylinder head. To ensure reliable contact, the candle is pressed against the cylinder with electric pliers, a screwdriver with insulated handles, or with a hand with dielectric gloves. You should not do this with your bare hand. If the cap breaks down, you can get a painful shock of a high-voltage discharge (up to 40,000 V at a weak current strength of up to 80 milliamperes).

Place the chainsaw on the ground, press it with your foot on the ground, and lightly pull on the starter cord. At this time, it will be seen whether there is a spark or not..