The Husqvarna 120 Mark II is one of the best chainsaws for homeowners cutting firewood, light felling, or limbing. Modern technology and advanced features make this chainsaw model particularly acceptable. Also, users mention some common problems with 120 Mark II like the engine won’t start, stalls while in use, runs poorly, and chain oiling problems.
You need to have a thorough understanding of how to solve these minor problems to keep the cutting operation running smoothly. Otherwise, your work may stop midway or may not start at all.
In this article, I will discuss detailed solutions to common problems encountered with the Husqvarna 120 Mark II. Even if you’re a novice user, following this guide will help you troubleshoot your chainsaw fast and get it back in working order.
Before discussing the issues, I would like to discuss the technical specifications and features briefly of this chainsaw model. This will help you get a better idea of performing this chainsaw.
Husqvarna 120 Mark II Problems And Fixes: Quick Table
This table provides a quick and easy-to-use resource for users to diagnose and fix common problems. The table lists the causes of various issues along with corresponding solutions. These will allow users to identify and resolve any problems they face quickly.
|Husqvarna 120 Mark II Problems
|Spark plug issue
|Clean or replace spark plug.
|Fuel related issue
|Discard used fuel and use fresh fuel.
|Clean and adjust the oiler.
|Low engine compression
|Wise to take the chainsaw to a service center.
|Clogged spark arrestor issue
|Clean or replace the spark arrestor.
|Dirty air filter
|Clean or replace air filter.
|Fuel line-related problems
|Replace fuel line alone with fuel filter.
|Clean carburetor properly.
|Rebuild and reset the carburetor well.
|Dirty spark plug and clogged air filter issue
|Clean or replace both the air filter and spark plug.
|Use fresh fuel and oil mixture ratio recommended by the company.
|Clogged oil ports issue
|Clean oil holes properly.
|Oil leaking problem
|Repair or replace the oil line.
|Inadequate oiling issue
|Check the oiler and oil guide plate; replace them if there is any problem.
Husqvarna 120 Mark II Problems And Fixes: Detailed Guide
I’ll provide here a detailed overview of the common problems of the Husqvarna 120 Mark II chainsaw and their respective solutions. The aim of the guide is to help users diagnose and fix common issues they may encounter with their chainsaws. Whether you are a seasoned user or a beginner, this guide will be a valuable resource in troubleshooting your 120 Mark II.
Problem Type A: The Engine Not Starting
Think about it, you want to work but the chainsaw won’t start, how annoying is that? Some Husqvarna 120 Mark II chainsaw users describe such experiences.
You may encounter this problem for several reasons, including a dirty spark plug, carburetor problems, fuel-related problems, or even low engine compression. Most of these problems are easy to fix and you can do them yourself.
1. Spark Plug Issue
A dirty spark plug or a damaged spark plug is one reason an engine won’t start. If spark plugs are not cleaned regularly or because of prolonged use, they can cause problems.
How To Fix:
Check if the spark plug is dirty. If it is dirty, clean it. Companies generally recommend replacing a spark plug after every 100 hours of use. Replace the plug on your chainsaw if you have used it for too long.
Sometimes there is a problem with the ignition coil, but not the spark plug. So don’t forget to check the ignition coil as well.
2. Fuel-Related Issue
Long-term unused or wasted fuel can also cause a chainsaw to not start. Many people leave their chainsaws with residual fuel in the chainsaw when they store them, which spoils and causes the chainsaw’s starting problems. Plus, using poor quality fuel or not using fuel and oil mixture as per the correct ratio can also cause this problem.
How To Fix:
Replace old fuel and use the correct fuel and oil mixture according to the company’s recommendation.
3. Carburetor Problem:
Chainsaws can have trouble starting if the carburetor fails to deliver the right amount of fuel and air to the combustion chamber. Here, the accumulation of dirt in the carburetors can cause blockages and cause disruptions.
How To Fix:
Remove the carburetor and observe its parts. Use a good curb cleaner to clean if dirt accumulates. If you found any damaged parts, just replace that. Then reinstall the carburetor carefully. If you are a new user, this task may be difficult for you. To manage this, the below video will also be helpful for you.
4. Low Engine Compression:
One sign of low engine compression is the relatively slow stretching of the starter rope. This type of problem can occur if the crankshaft seal or gaskets are leaking or the piston or the piston rings are damaged.
How To Fix:
Check engine compression to be sure. If it’s below 50 psi, there is definitely a problem. Troubleshooting this type of problem can be a little tricky for beginners and it would be wise to take the chainsaw to a service center.
Problem Type B: Engine Stalling While In Use
If the chainsaw stops repeatedly while using it, it can be very annoying. No one wants to pull the starter rope repeatedly while woodworking. You may face this problem because of several reasons. Among these are a clogged spark arrestor, a dirty air filter, fuel line-related issues, and a dirty carburetor.
1. Clogged Spark Arrestor Issue:
The spark arrestor is a small screen that prevents sparks emitted by the engine from escaping the muffler. Over time, the arrestor can become clogged with soot, causing the chainsaw engine to stop.
How To Fix:
Clean the spark arrestor using a wire brush and reattach it. It is best to replace the spark arrestor if it is too old.
2. Dirty Air Filter:
A dirty air filter can restrict the supply of air to the combustion chamber. As a result, the chainsaw stops when in use. A dirty air filter can cause the engine to shut down at idle, as well as not run at high speeds.
How To Fix:
Clean and reattach the air cleaner. Companies recommend homeowners replace the air cleaner in their chainsaws twice a year. Replace the air filter on your chainsaw if it is older.
3. Fuel Line-Related Issue:
Many times, because of dirt buildup in the fuel lines and fuel filter, the correct amount of fuel does not reach the combustion chamber. Here, the chainsaw does not run smoothly but stops repeatedly.
How To Fix:
Clean the fuel line and fuel filter thoroughly. Companies recommend replacing the fuel filter at least once a year. Replace both the fuel filter and fuel lines if necessary.
4. Clogged Carburetor:
A clogged carburetor can cause the chainsaw to stop repeatedly. In this situation, too, the carburetor cannot work because of the accumulation of dirt, or some of its parts are damaged.
How To Fix:
Clean and reinstall the carburetor using a good quality curb cleaner. If any part is damaged, replace it.
To solve engine stalling issues while in use, you may also check the short video below.
Problem Type C: The Chainsaw Runs Poorly
When your chainsaw runs poorly rather than properly, you won’t be able to finish any job on time. Operating a chainsaw in this condition is quite annoying.
Several factors are responsible for poor running, including carburetor problems, dirty air cleaners, fuel issues, and dirty spark plugs.
1. Carburetor Problem:
You can think of the carburetor as the heart of the chainsaw. That’s why chainsaws run poorly when carburetor problems occur. Accumulation of debris or deterioration of parts is the major cause.
How To Fix:
You may need to rebuild the carburetor. For this, you can collect a carburetor rebuild kit. But the task can be a bit complicated for beginners. The video below may help them further. Although this is about the Husqvarna 136 Chainsaw’s carburetor and fuel line, you can follow the same procedure for the 120 Mark II.
2. Dirty Spark Plug And Clogged Air Cleaner issue:
A clogged air filter or a dirty spark plug can often be blamed for a chainsaw running poorly.
How To Fix:
Clean the air filter and spark the plug well. Replace them if necessary.
3. Fuel Issue:
Fuel can play a role in your chainsaw running poorly. Such problems can occur because of poor quality fuel and using the wrong fuel and oil mixture.
How To Fix:
Use quality fuel. Always use a mixture of fuel and oil according to the ratio recommended by the company.
Problem Type D: Chain Oiling Issues
Almost all chainsaws have some problem with chain oiling. In most cases, this problem is exacerbated by excessive dirt accumulation or the chainsaw becoming old over time. Notable among chain oil-related problems are inadequate oiling, leaking oil, and clogged oil ports.
1. Clogged Oil Ports Issue:
Since the chainsaw generates a lot of dust during operation, it is common for dirt to build up in various parts of the chainsaw. This dirt often clogs the oil holes of the chainsaw and even the oil holes in the guide bar. As a result, the guide bar and chain cannot be lubricated, and various problems arise.
How To Fix:
Clean the chainsaw thoroughly. Be especially careful when cleaning oil holes and guide bars.
2. Oil Leaking Problem:
Over time, chainsaw oil lines become old and crack. At some point, oil started leaking from this place. It can lead to wastage if not initiated at the right time.
How To Fix:
Monitor oil lines. Repair, or replace them if a problem occurs. Also, observe the oil guide plate. If there is a problem here, also replace it.
3. Inadequate Oiling Issue:
If the chainsaw oiler does not work properly, problems such as inadequate oiling to the guide bar and chain may occur. In such a situation, there can be problems like poor cuts and kickbacks.
How To Fix:
Insufficient oil may require repair or replacement of the oiler to resolve the problem. This task can be a bit difficult for beginners. I would like to share a short video here that can help even a novice to replace the oiler.
Specifications And Features Of Husqvarna 120 Mark II
The technical specifications here will reveal how effective this chainsaw model is. Besides, modern features will provide a better idea of what benefits you may get from this chainsaw.
- Power source: Gas
- Displacement: 38.2 cc
- Power output: 1.88 hp
- Idling speed: 3000 rpm
- Maximum speed: 9000 rpm
- Oil tank volume – 0.15 Litres
- Powerhead weight: 4.85 kg
- Recommended guide bar length: 14 inches
- Fuel tank capacity: 0.3 Litres
- Air Injection: It is a centrifugal air cleaning system that contributes to low wear. Because of this feature, you need to clean the filter less and can operate the chainsaw for a longer time.
- X-TORQ engine: These chainsaw models come with a powerful X-TORQ engine capable of increasing fuel efficiency by up to 20%. Also contributes to reducing emissions by up to 60%.
- Separate choke/stop switch: Husqvarna 120 Mark II chainsaws have a separate choke/stop switch. This feature benefits you when you choke to help prevent accidental flooding, the stop switch will automatically reset.
- LowVib: The LowVib feature is very effective for vibration control, which saves the user’s arms and hands from tiring.
- Inertia chain brake: This feature acts as a handguard to protect the operator’s hands from slaps and tree branches. It can also help protect against accidental cuts.
What Are The Possible Causes Of The Chain Coming Off The Bar On A Husqvarna 120 Mark II?
Several reasons can cause the chain to come off the guide bar on a Husqvarna 120 Mark II. Notable among these are:
- Using the wrong guide bar and chain.
- Improper chain tension.
- Sometimes small twigs can get stuck in the chain or sprocket.
Prevention and Maintenance of Husqvarna 120 Mark II Chainsaw
I would like to provide tips and recommendations on how to care for the chainsaw to ensure its longevity and optimal performance. People follow daily, weekly and monthly routines for chainsaw maintenance. I am referring here to a daily routine.
This is because daily maintenance of a chainsaw is essential for ensuring its proper functioning and safety. Regular cleaning, tightening of bolts and nuts, checking for worn or damaged parts, and oiling the chain are crucial steps for preventing malfunctions and accidents. Proper maintenance also helps keep the chainsaw’s cutting performance sharp and improves its fuel efficiency.
Daily maintenance checklist:
- Clean the outside of the chainsaw using a brush or air compressor.
- Clean the chain brake and clutch mechanism inside the side cover.
- Observe the throttle mechanisms to see if they are working properly.
- Examine the chain catch for any damage.
- Check that the guide bar is in the correct shape.
- Clean every groove of the chain and guide bar well.
- Check if the oil holes are open.
- Sharpen the chains if they become dull.
- Check if the chain tension is correct, and adjust if there is a problem.
- Observe the drive sprocket and replace it if problem.
- Clean the air intake area if there is any dust.
- While attaching the side covers, ensure that all screws are tightened properly.
- Check if the stop switch works properly.
- Observe the fuel lines for cracks.
User Feedback of Husqvarna 120 Mark II Chainsaw
User feedback offers insights into the experiences and opinions of individuals who have used the chainsaw. It provides a comprehensive overview of its strengths and weaknesses. This information can be useful for potential buyers who are considering purchasing the chainsaw, as well as current owners who are looking for information on the product’s performance.
One Husqvarna 120 Mark II user reported that his chainsaw suddenly won’t rev after starting. Although it drains well, the motor bogs on restart. Once it stops, the chainsaw needs to rest for 10 minutes or more.
He took care of the carburetor, spark plugs, and air filter, though did not replace any other parts except the air filter. He uses a specific fuel he uses in the 120 Mark II as well as his other chainsaws. No other chainsaws have this problem. Note that he has two 120 Mark II chainsaws, one of which is having problems.
Another user reported that he has been using his Husqvarna 120 Mark II chainsaw for about 2 years. The chainsaw starts well and runs, but shuts down within 30 seconds under heavy load. It overheats in no time. Although it is inactive, it dies within a few moments.
He checked the compression of his chainsaw, which gets up to 70 psi. He rebuilt the carburetor. Even then, the adjustment of high and low-speed screws is not working at all.
Frequently Asked Question
Why Is My Husqvarna 120 Mark II Producing Excessive Vibration While In Use?
If the guide bar and chain are not lubricated or the chain tension is not correct, the chainsaw can vibrate excessively. Plus, if any part of the chainsaw is damaged or broken, it can also create extra vibration.
How Can I Adjust The Carburetor On A Husqvarna 120 Mark II Chainsaw?
This chainsaw model has 3 screws to adjust the carburetor. Turn the L screw clockwise to increase idle speed. The H screw should be turned clockwise to increase the speed. Similarly, turn the T screw clockwise to increase the choke. In contrast, turn the screws counterclockwise to reduce any speed.
Can I Replace The Bar And Chain On A Husqvarna 120 Mark II With A Different Size?
Yes, you can use different sizes of guide bars and chains on these chainsaws. The company recommends using a 14-inch to an 18-inch guide bar. You can use any size within these measurements.
What Is The Recommended Oil-To-Gas Ratio For The Husqvarna 120 Mark II Chainsaw?
The company recommends using a 50:1 mixture of gas and oil in 120 Mark II chainsaws. This means you need to mix 50 parts gasoline with 1 part 2-cycle engine oil.
What Is The Maximum RPM For Husqvarna 120 Mark II?
The maximum rpm for Husqvarna 120 Mark II is 9000.
Is The Husqvarna 120 A Good Saw?
Yes, this can be a great chainsaw for homeowners to complete medium to large-sized jobs.
Final Words Regarding Husqvarna 120 Mark II Chainsaw
The Husqvarna 120 Mark II chainsaw is a reliable and powerful tool that can handle a variety of cutting tasks. Like any other tool, you may face some problems while using it. Anyway, I have detailed here the common problems that can occur with a Husqvarna 120 Mark II chainsaw and how to fix them.
Whether you are an experienced or a beginner, this writing will guide you in maintaining and troubleshooting your chainsaw. Always remember, there is no substitute for regular maintenance to keep an appliance running effortlessly for a long time. By following the maintenance tips, you can run effectively for years.