Chainsaw Has Spark and Fuel Won’t Start (360 Guide)

A chainsaw is a useful instrument for cutting firewood, trimming undesired branches, and clearing away fallen trees. When starting up, particularly older versions with wear and tear, they might be difficult. 

There are a number of various causes for why a chainsaw won’t start. Based on whether it is a gas or electric chainsaw.

The most frequent reason is gasoline. That has degraded and is obstructing lines, pumps, carburetors, or other fuel system components. A moist spark plug alone does not guarantee effective fuel atomization.

The typical repair involves draining the fuel system and rebuilding the carburetor.

That entails cleaning and switching out valves, diaphragms, and other components. The possibility of temporal alignment loss is the next probable factor. This is unlikely if the saw’s motor was not damaged. 

Chainsaw Has Spark and Fuel But Won’t Start: Solutions

A malfunctioning spark plug may need to be changed. Your chainsaw’s spark plug may be broken. It won’t be able to generate enough electricity to start the engine. 

Take out the spark plug to see whether it’s soiled, fractured, eroded, or otherwise damaged.

A burned-out electrode or a significant carbon buildup might also exist. Replace the spark plug with a new one if it exhibits any of the following problems. 

Replace the spark plug even if it seems to be in good condition on the surface. But hasn’t been replaced in a few seasons. It may be necessary to clean the carburetor since it is clogged.

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The internal combustion motor of a chainsaw is started by the carburetor. That combines gasoline and air. Long-term storage of gasoline may cause it to thicken and clog the throttle.

Makes it difficult to start the engine. Clean the carburetor if the obstruction is just small. Drain the gasoline from the carburetor. Spray it with a specific cleaning solution, then wipe it down to clean it.

There are some additional things that should be implied: 

1. Need to Replace the Carburetor

It could be necessary to replace the carburetor if it cannot be fully cleaned. Or if multiple cleanings fail to remove all the buildup. It can be broken or old and thus no longer function.

Disconnect the air filter, and add a teaspoon of gasoline. And pull the starting rope to test the carburetor. The carburetor is most likely to blame if the engine briefly starts before shutting off. 

Follow the manufacturer’s directions to swap out the carburetor. Then buy a replacement that is appropriate for the chainsaw.

2. Replacement of the Ignition Coil is Required

The spark plug receives electricity from the ignition coil. Then it generates a spark that burns the gasoline and starts the chainsaw. If the engine won’t start, the coil can be faulty.

That can develop over time with frequent usage. Purchase an ignite coil tester and adhere to the manufacturer’s directions. Once you’ve established that the starter motor is not the problem. 

During testing, if there is no spark, it is probable that the igniter coil is broken. And it has to be replaced. A damaged recoil starter that has to be replaced may be the root of the problem.

An engine for a chainsaw may be started using a recoil starter. Pulling up on the starter rope activates the internal starting mechanisms. The engine won’t start if the ejection starter is broken or poorly put together.

Remove the rebound starter assembly first from the chainsaw to observe what’s occurring. In order to determine if it is faulty. It may be necessary to reposition the pulley system since it may be jammed. 

The rebound starter may need to be changed if you follow this procedure. And the chainsaw still won’t start.

3. Damaged Rewind Spring May Be Present in the Chainsaw

The rebound starter assembly includes a rewind spring. That is responsible for winding the starting cord after each draw. A damaged rewind spring is most likely the cause of the problem.

And it has to be replaced if, after the first pull, the cord doesn’t retract. And the engine won’t start. The rewind spring may be changed separately in certain chainsaw models. 

Others can call for the user to completely swap out the recoil starter.

4. The Gasoline in the Chainsaw’s Engine is Overflowing

Among the most frequent causes of a chainsaw not starting is a gasoline problem. The engine may have unintentionally flooded with gasoline.

If the user attempted to start your chainsaw using the recoil starting method repeatedly. 

The scent of fuel in the air is often a sign that the motor has been flooded.

If you think the chainsaw engine has flooded with gasoline, pull the ignition cord repeatedly. While maintaining throttle control, dry and reinstall the starter motor.

5. When It’s Warm Outside, the Choke is Triggered

In cold weather, the choke position on many chainsaws is utilized to start the saw. This setting aids in enhancing the carburetor’s air. And fuel mixing richness to enhance fuel flow. 

The choke may rapidly flood the engine if it is triggered in moderate or warm weather conditions. Or when the saw has been utilized and is already heated. This is because the choke does not need that much heat to start. 

When troubleshooting a chainsaw in a warm or moderate environment. The operator should ensure the throttle is not engaged. The techniques above may be used to fix an engine. 

The engine that has been flooded if it has been on.

6. The Gasoline Has to Be Replenished Since It Has Degraded

A chainsaw’s performance may be impacted by the kind and amount of gasoline it uses. It is much like many other mechanical devices. Before using their chainsaw, owners should make sure the engine is properly fuelled. 

If gasoline is left unused and standing, it will begin to degrade. So be cautious to ensure that no old fuel has accumulated within. If the saw hasn’t been used for a while. 

If so, the fuel tank must be cleaned and filled with new fuel. You may have to take it to a professional or get a new one. If your chainsaw still won’t start.

Reach out to a specialist who can handle the work while you seek a diagnosis. And look into the best chainsaw choices if you urgently need branches pruned or a tree removed.


Do Flooded Engines Still Start?

In this situation, an engine won’t start until the too-rich combination has been removed. The mixture’s exceeding the maximum destructive limit for the specific fuel is what causes this.

What Results in a Carburetor Flooding?

When the engine is started, fuel either pours into the inlet manifold or spills over the surface of the carburetor. Usually, either debris between the needles and seat or a blocked float causes this issue.

Why is the Carburetor Using too Much Fuel?

It indicates that the fuel bowel’s needle valve is jammed in the available spot. Typically, fuel enters the carburetor plate up to a certain point before the carburetor float lifts the needle and closes the valve to prevent further fuel entry.


So by now, you know why your chainsaw has spark and fuel but won’t start.

However, consider safety first and work on the premise. The chainsaw might start at any moment before starting an inquiry or fixing the problem.

Avoid wearing baggy clothes, and keep the saw pointed away from people, cars, and buildings.

Jim Boslice

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