Nothing is more worrisome than the smell of smoke coming from your chainsaw. Whether it’s a new model or one that has been in use for years, a smoking chainsaw can be a major inconvenience and could potentially lead to bigger problems if left untreated.
Don’t panic just yet – there are some common causes for this issue, and luckily it can often be easily fixed with some simple troubleshooting tips. In this blog post, we’ll take an in-depth look at why your chainsaw might be smoking, what you should do about it, and how to keep it running smoothly in the future. Read on to learn more!
Why Is My Chainsaw Smoking?
Chainsaw smoke occurs when oil build-up accumulates in the machine or fuel isn’t burning correctly due to air leaks or clogged vents. This happens when you don’t properly service your chainsaw – like not changing the spark plug or not cleaning out the air filter regularly and often enough.
The oil sitting in the combustion chamber will eventually be heated up by the engine, leading to it becoming airborne and creating that tell-tale smoky haze.
5 Main Causes Of Chainsaw Smoke
In general, there are five main causes of smoke from a chainsaw. Take note of the 5 causes of chainsaw smoke below to solve the issue of why is my chainsaw blade smoking and not cutting.
1. Dirty Air Filter
The first and most common cause of chainsaw smoke is a dirty air filter. Chainsaws need clean air to run properly, and a clogged air filter can cause smoke due to the accumulation of oil, dirt, and debris in the combustion chamber.
2. Excess Oil In The Oil‒gasoline Mixture
The second most common cause of chainsaw smoke is an incorrect fuel mix ratio. Chainsaws use a mixture of oil and gasoline, but if too much oil is put into the tank, it can lead to a build-up of excess oil – causing smoke or, even worse – engine seizure.
For instance, A 50:1 oil/fuel ratio is recommended by Husqvarna for chainsaws up to 75cc and 33:1 for chainsaws 76cc and larger.
3. Poor Oiling Causing Friction
Another problem that can arise is poor lubrication of parts inside the chainsaw’s engine. If not enough oil is used to lubricate the saw’s chain and guide bar, friction can occur which produces a lot of smoke.
4. Unsharpened Chainsaw Chain
Another common cause of chainsaw smoke is an unsharpened chain. Chainsaws need regular sharpening in order to work efficiently, and if they are not sharpened properly, then smoke can be produced due to increased friction from the dull blade against the wood.
5. Tight Chain
Lastly, a tight chain on the chainsaw can also produce smoke as it drags against the sides of the bars instead of cutting through them smoothly. This causes more heat to build up in the engine, leading to a smoky haze coming out from underneath your chainsaw.
How To Fix Chainsaw Smoking?
After finding out the causes of why is my chainsaw bar smoking, we will show you several ways of fixing chainsaw smoking. Below are some of the solutions to fix and prevent this problem.
1. Fill-Up Your Bar Oil
First, you need to ensure that you are using the correct bar oil in the chainsaw’s fuel tank. Chainsaws require special two-stroke engine oil, and using a different type of oil can cause smoke due to its inability to lubricate correctly.
2. Check Your Chain Tension
Next, make sure your chainsaw chain is properly tensioned on the guide bar. Chains need to be taut enough so they can cut through wood without causing too much friction – if it’s too tight, then it will drag on the sides of the bar, which will create heat and smoke.
While you are checking the chain area, also check the chain oil to ensure it is properly lubricated.
3. Sharpen Your Chain
Thirdly, sharpen the chain regularly with a round file and depth gauge tool to keep it sharp and reduce friction when cutting.
It is also essential to replace the dull chain with a new chainsaw chain. This will make your work go better.
4. How To Fix Bad Fuel
Finally, if your chainsaw has been sitting for a while and you have bad fuel in the tank, then empty it out and fill it up with fresh fuel before starting the saw again.
Bad fuel can cause disruption to the chainsaw engine.
These are just a few of the most common causes of chainsaw smoke and how to fix them. Taking care of your chainsaw regularly will help ensure that it runs smooth and produces less smoke.
Also Read: How to Split Firewood With a Chainsaw?
Frequently Asked Questions
What causes my chainsaw to smoke?
There are five main causes of smoke from a chainsaw: a dirty air filter, an incorrect fuel mix ratio, poor lubrication of parts in the engine, an unsharpened chain, and a tight chain.
How do I stop my chainsaw from smoking?
You can stop your chainsaw from smoking by ensuring you are using the correct bar oil in the chainsaw’s fuel tank, checking your chain tension, sharpening your chain regularly and emptying bad fuel out of the tank before starting it again.
Why is my chainsaw blowing blue smoke?
Blue smoke being emitted from your chainsaw means that there is an accumulation of oil in the combustion chamber, which has been heated up by the engine, leading to it becoming airborne.
Try to locate the source of the extra oil, if necessary, you can inspect and clean out the chainsaw’s air filter to remove any excess oil.
What happens when a chainsaw overheats?
When a chainsaw overheats, it can lead to serious damage to the engine components and may also cause smoke to be emitted from the chainsaw. To prevent this from happening, ensure that you are using the correct bar oil in your chainsaw’s fuel tank and check your chain tension regularly.
Why is my chainsaw smoking on startup?
Smoke coming out of your chainsaw on startup could indicate an incorrect fuel mix ratio or a dirty air filter. Make sure you are using fresh gasoline with two-stroke engine oil.
Chainsaw smoking is a common issue that can cause serious damage to your chainsaw if not addressed properly. To prevent this from happening, ensure you are using the correct bar oil in your chainsaw’s fuel tank, check your chain tension regularly and sharpen it with a round file and depth gauge tool.
Remember also to check other parts. You may find an idle screw or carburetor needle that needs adjustment.
On top of that, replace any old fuel in the chainsaw’s tank with fresh gasoline mixed with two-stroke engine oil before starting it up again. Following these steps should help reduce smoke emissions from your chainsaw significantly and permanently resolve the problem of why is my chainsaw smoking and not cutting.
Michael Boyle is the founder and main author of Chainsaws Finder, boasting over 20 years of experience in the chainsaw industry. Hailing from Texas, Michael combines his extensive knowledge and hands-on expertise to provide reliable advice and top-notch service. His vision is to empower chainsaw users to tackle any project with confidence, making Chainsaws Finder a trusted resource in the field.