Chainsaw No Spark: Causes & Solution (Explained)

Chainsaws may lack a spark due to a number of issues, including faulty spark plugs, bad ignition coils, and ignition switch problems. Spark plugs, responsible for igniting the fuel mixture in the engine, should be inspected if damage or wear is suspected. A bad ignition coil, another cause of this issue, can be tested by isolating the coil and checking if a spark is present. Problems with the ignition switch, which controls electricity flow to the ignition system, can also interrupt the spark. Other potential issues include wires touching a metal point on the “On-Off” switch, complications with the kill wire or faulty flywheel components. If none of these solutions work, testing a new spark plug may be necessary.

A chainsaw is a saw that has sets of teeth connected with the chain that rotates along the guide bar.

Chainsaw is especially used for cutting, feeling, harvesting activities, and forests management.

Various types of chainsaws are used according to circumstances such as electric, petrol, and battery-powered saw.

A chainsaw is a useful cutting tool and ideal for everyday use.

If somehow it doesn’t operate properly, you shouldn’t panic. You may experience no spark in it when you try to start.

It’s not a big deal and can be fixed in a simple and hassle-free way.

Let’s get started!

Chainsaw No Spark

Why no spark?

First of all, you need to know the reasons behind no spark in your chainsaw. It can be due to these:

Check the spark plug

The most common reason for a chainsaw to have no spark is a faulty spark plug. The spark plug is responsible for igniting the fuel mixture in the engine. If it’s damaged, fouled, or worn out, it won’t be able to create a spark. Inspect the spark plug for any visible damage or excessive wear. If it appears to be in poor condition, replace it with a new one.

Inspect the ignition coil

A bad ignition coil can also cause a chainsaw to have no spark. To test the ignition coil, disconnect the positive wire from the coil to eliminate the electrical system and isolate the coil.

Remove the spark plug, put it back in the boot, and ground it to the engine. Pull the recoil and check for a spark. If there is no spark, it is likely a coil problem

Ignition Switch Problems

The ignition switch controls the flow of electricity to the ignition system. If the switch is faulty or has loose connections, it can interrupt the spark. Check the ignition switch for any signs of damage or loose wires. If it appears to be faulty, replace it with a new one.

Check the On-Off switch

Ensure that the wires leading to the “On-Off” switch are not tangled or touching a metal point on the engine. This can cause a lack of spark.

Inspect the kill wire

Some chainsaws have a kill wire attached to the ignition coil. Disconnect the kill wire and check for spark again. If there is spark when the kill wire is disconnected, the issue may be with the kill switch or wiring.

Sheared flywheel key

The flywheel key helps time ignition. If it shears, the flywheel timing will be off. Realign the flywheel or replace the key.

Sheared flywheel magnets

If the magnets on the flywheel break or detach, ignition fails. The flywheel will need to be repaired/replaced.

Test with a new spark plug

If you have tried the above steps and still have no spark, try using a new spark plug to rule out any issues with the old plug.


A chainsaw is a valuable tool for cutting wooden surfaces and timber.

When there’s no spark in it, you can fix it on your own without the help of a professional.

You can start the brake, activate Smart Start, start the fuel pump, pull the starter, and push the throttle. It can work.

When your Chainsaw fails to deliver sparks during cutting, there must be some problem with the tool.

The article explains the integrated search and personal experience and the tips and methods to adjust and fix this anomaly.

I hope this information would be a great help for you in dealing with chain saw no spark.

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