No spark on a Chinese chainsaw

The engine “shoots

If during operation there are extraneous sounds similar to shots, then there is a problem with the muffler or carburetor. How do I keep my chainsaw quiet? It depends on which node the fault is in.

The chain falls

Why does the chain fly off the tire? There may be several reasons and they are all different:

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  • Drive or driven sprocket is worn. Due to the fact that the sprocket is worn out, the adhesion to the chain decreases, which is why the chain flies off the chainsaw. Sprocket replacement required.
  • The chain stretched out. Why does the chain stretch on a chainsaw. due to insufficient lubrication. The metal heats up and stretches, albeit by a fraction of a millimeter, but if you take into account the number of links, then even 3-4 mm is enough for the chain to fly off the tire. The chain needs to be changed.

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  • The chain tensioner, which regulates its tension, is loosened. how to adjust the chainsaw, or rather the chain tension? You need to adjust the tensioner. this can be done in just a few minutes.

Top Reasons Chainsaw Won’t Start — Chainsaw Troubleshooting

The chain does not rotate

Why the chainsaw chain does not rotate when the engine is running even at full speed?

  • Leading asterisk. Either it is jammed, or the crown is worn out so much that it does not engage and the chain does not spin on the chainsaw. In any case, it is necessary to disassemble the sprocket in order to find out the exact reason why the chain does not spin. If the crown is worn out, it is necessary to replace the sprocket (or the crown itself, if the sprocket has a prefabricated structure).
  • The chain brake is stuck. As a result, the sprocket is blocked by the brake mechanism, while the motor runs. Stop the engine and release the brake. If this happened under load, the brake mechanism will have to be changed, as well as the sprocket, because due to the high temperature, many elements can melt and overheat.
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Stalls and does not work at idle:

  • The muffler is clogged. It is necessary to remove carbon deposits.
  • Lost carburetor settings. Idling adjustment is required on the chainsaw. It is carried out using the adjusting bolts marked L and H. How to adjust the idle speed, see the article on adjusting the carburetor.

Chain lubrication problems

For proper operation, the chain must be constantly lubricated in order to reduce friction between the tire and the links, and also to prevent premature wear of the links.

  • If the chain is not lubricated on the chainsaw, then there is a problem with the oil pump. oil is not supplied due to a clogged channel. Lack of lubrication is the reason why the chain stretches or why the chain breaks. Clean the channels, the smallest particles of shavings constantly get there and clog them. May also cut off the oil hose. If you need to adjust the oil pump of the chainsaw or repair it, it is better to contact the service.
  • Splashes oil from the chain. Incorrectly selected lubricant. it is too liquid, therefore it does not so much lubricate the links as splashes on the wood. Replaces grease with a thicker one.

Stalls immediately after launch:

  • The fuel mixture is not prepared correctly, there is too much oil in it, so the octane number of gasoline is less than it should be, so the chainsaw only works on suction or immediately stalls.
  • Spark plug carbon or improper spark plug-to-wire gap.

The chainsaw does not cut under load and stalls

  • Clogged air filter. It is necessary to take out the filter, clean it well or even rinse it, dry it and put it back.
  • Incorrect proportion of oil / gasoline mixture. Drain fuel and re-mix oil and gasoline in the correct proportion.

Step-by-step diagnostics of ignition with a multimeter:

  • We set the multimeter to the position in which the arrow is at the 200 ohm mark.
  • We study the instructions for the chainsaw. We find out the optimal resistance for the coil winding installed on our model (in most modern chainsaws, this indicator fluctuates within 3-5 ohms.);
  • We connect the multimeter to the primary winding of the coil and measure the resistance, if it is normal, we continue testing;
  • We connect the multimeter to the secondary winding of the coil, compare the readings obtained with those indicated in the instruction manual;
  • We connect the multimeter to the coil hole into which the wires are inserted. If the device gives normal readings, we come to the conclusion that the coil is in good working order. If the measurement results are far from optimal, you will have to replace the assembly (coil) with a new one;
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Diagnosis of malfunction with a multimeter

Determine the malfunction of the ignition coil using the so-called hardware method. However, for this you must have a multimeter with which diagnostics are carried out.

Chain brake

Features of modern electronic ignition systems

Today’s ignition systems have changed and have features that change momentum based on saw speed. This “curve” is programmed into the “chip” and helps the saw to produce more energy, so the modified impulse gives the fuel more time to burn, thus getting more energy stored in the fuel. In addition to more power, some ignition systems make initial starting of the saw easier.

While ignition systems get more powerful and more powerful, the components themselves are getting smaller and more durable. Nowadays, the failure of the ignition coil of a chainsaw is a rarity.

Ignition systems have come a long way in the past ten years, but engineers say new technologies will drive even greater improvements in the coming years.

Hopefully this information will help you diagnose and fix problems with your saw’s ignition system. If you did not manage to fix the breakdown, we are always glad to see you in our workshop. We offer only high-quality repair of chainsaws. Our workshop phone number 8 (499) 390-93-49

Ignition adjustment

As we have already noted, you can adjust the ignition system both in the workshop and at home. To do this, you need ordinary wrenches, a screwdriver and a 0.4 mm dipstick (you can make a dipstick with your own hands from scrap materials. plain copier paper, a plastic bottle, etc.).

Next, look at the wires leading from the coil, whether there is any breakage or damage to the insulation on them. Motor vibration can cause wires to rub against each other or other component. Even the strongest insulation suffers from friction.

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A switch wire that has been rubbed long enough can have the same effect as a switch when you turn off the saw. In other words, close the coil control wire.

Other problems arise when wires run between parts of the saw’s anti-vibration system. Constant bending and stretching can eventually lead to their destruction. Sometimes these breaks are not obvious because they occur inside the insulation. A break is sometimes difficult to find because the wire may look perfect on the outside.

The spark plug wire also needs to be checked. Sometimes the spark plug cap can cause problems. A visible sign of a problem is a brown or burnt residue on the outer ceramic of the spark plug. This is a sign that the spark is walking along the outer ceramic coil of the spark plug. At this time, the saw can work, but the work will be unstable and currents will walk.

Check the spark plug cap for damage and cracks. If the spark plug wire cap is damaged, the saw may still operate, but may give the operator an unpleasant pain shock if they get close to it. In the above photo, watch out for the wire and cap. There is also a failure of the transistor, which is embedded in the cap, on some saw models.

In the ignition system, the saws often fail to switch off switches, they can be checked. Disconnect the switch wires from the module and check the ignition. Sometimes a switch causes it to be permanently “off.” If you have spark after opening the breaker, replace it and test the saw.

The sheath on this wire is worn out, showing wear in the area of ​​moving parts. All wires are susceptible to vibration damage and should be checked from time to time.

Check the wires constantly, they should not be tight or broken, and the wires should not tightly touch vibrating parts.