Spark plugs are one of the main components of a power tool like the STIHL chainsaw because it ensures the ignition of the air-fuel mixture in the cylinder. That’s why most of the time, users face different issues regarding spark plugs.
So if you’re someone who doesn’t know what’s going wrong in the spark plug and you want to know before going to the mechanic, then you’re at the right place.
Here in this article, we’ll discuss the Stihl chainsaw spark plug and everything about it. Also, here you’ll get to know the symptoms of faulty spark plugs. So let’s get started.
What Spark Plug Does a Stihl Chainsaw Take?
A spark plug plays an important role in every power tool, like in a chainsaw. However, a chainsaw needs three components to function, and one of them is sparking plugs.
There are two distinct types of spark plugs used in Stihl chainsaws, each of which corresponds to a certain chainsaw model. Stihl chainsaws use either NGK BPMR7A or NGK CMR6H spark plugs. Here are some reasons for using NGK spark plugs.
- Performance
The reason behind using the NGK spark plug is its performance. NGK spark plugs made from high-quality iridium last significantly longer than those made from copper or platinum.
After extensive testing, it was determined that NGK Spark Plugs offered the best balance of performance, efficiency, longevity, and dependability, making them one of the best-reviewed spark plugs.
- Longevity
However, NGK copper plugs are the best available alternative if convenience is a priority. They are the priciest but last the longest and can take you as far as 80,000 miles.
- Efficiency
When it comes to customer service, NGK excels. This plug is superior to others in that it reduces fuel consumption and ensures a quick and responsive engine. This is due to the ultra-fine electrode wires employed in its construction.
NGK spark plugs are designed to maximize the efficiency of the air-fuel mixture, which results in a notable increase in output and kinetic energy.
How Often Should You Change The Spark Plug On Your Stihl Chainsaw?
To get an internal combustion engine running, all you need is a spark plug and some electricity. Damage to the spark plug can prevent the engine from starting or reduce its efficiency. It could lead to extra work for you or unsafe conditions in the workplace.
Nevertheless, spark plug replacement is recommended by STIHL after approximately 100 hours of use. You should make it a habit to inspect the spark plug’s condition every 10 to 15 hours of use.
However, the outer electrode should have some light brown deposits if the engine functions normally. If you see thick, black deposits, it’s likely because your fuel isn’t getting enough air.
Spark Plug Gap in STIHL Chainsaw
The spark plug gap is the location where the spark discharge is intended to take place in the spark plug. It is the region of a traditional spark plug that can be found between the center electrode and the ground electrode.
However, the spark plug gap doesn’t create any problem until it’s too large. If the gap between the spark plug electrodes in your car is too large, the spark plugs will require a greater voltage in order for the ignition spark to travel over the gap.
The engine can’t always provide the additional voltage required to bridge the gap; thus, the spark is weaker, and your fuel combination will not ignite as it should.
Signs Of A Misaligned Spark Plug Gap in STIHL Chainsaw
An improperly gapped spark plug can lead to several engine problems, including releasing an undesired flame, overly rapid firing, failure to start the engine, and poor fuel efficiency.
- Each one of the step-stroke engines operate at peak efficiency. The gap must be set per the manufacturer’s guidelines for optimal engine performance. An improper gap causes a random spark that slows the combustion process.
- The sound of the engine pinging is an indicator that the spark plug gap is off. Again, this will cause the engine to delay the spark and reduce performance.
- When the correct distance separates the electrodes and the center, the ignition mechanism will function properly. Unnatural flames may emerge from the engine if the spark plug is not correctly gapped.
- When an engine has a rough or erratic idle, it’s usually because of faulty spark plug settings. However, we regret to inform you that inspecting the spark plug gap can easily diagnose the problem.
- The acceleration of a two-stroke engine can stutter at times. Not to worry; the problem is likely to be found in the spark plug gap.
Maintenance Of Stihl Chainsaw Spark Plug
Regular maintenance allows you to get a better lifespan of the chainsaw spark plug. Here are some steps that you can follow along.
- Simply removing the cover allows you to get to the spark plug; that is the first step toward spark plug maintenance.
- After the shield has been taken off, the spark plug’s cap and wire can be detached. First, inspect the top of the contact for corrosion; if any is present, remove it with a wire brush before proceeding.
- An open-ended socket wrench turned counterclockwise will free the spark plug from the engine. Inspect the spark plug for damage or corrosion, then double-check the electrode contacts. You can use the wire brush to remove any carbon buildup.
- Thread the spark plug back into the engine if you successfully cleaned the electrode and contact post. Put the socket wrench to good use and make sure it fits snugly. Avoid squeezing too hard.
- The last step is to make sure the post’s cap and wire click into place when you’re through attaching them.
FAQs
- What Size Spark Plug Does a Stihl Chainsaw Require?
Spark plugs for chainsaws are not organized by size but rather by part number. However, the hex head size and thread length/diameter might vary from spark plug to spark plug. If you want to make sure you’re using the right spark plug in your chainsaw, check the manual.
- Do spark plug gaps get bigger with age?
After extensive use, the gap typically closes. A greater gap in the spark plug of a chainsaw causes an abnormal flame to be produced by the motor. The distance between the side and center electrodes may widen if the chainsaw is operated inconsistently.
- What steps are involved in inspecting the spark plug on a Stihl chainsaw?
An inline spark tester can be used to inspect the ignition coil. To inspect the spark plug, you must remove it and look for signs of carbon buildup or heat damage on the end of the spark plug where an electrode would normally be located.
- What kind of spark plug does a Stihl MS881 chainsaw require?
The NGK BPMR7A spark plug is the recommended replacement for the Stihl MS881 chainsaw. To replace an NGK BPMR7A spark plug, you’ll need a wrench that measures 3/4 inches across (19mm).
- How do you figure out the size of the threads on the spark plugs?
Spark plugs are installed into the cylinder head via the thread size. A collection of integers (such as 14×1) indicates the diameter and the pitch or distance between each thread, respectively. Dimensions are given in millimeters.
Conclusion
Till now, we answered all the questions regarding the Stihl chainsaw spark plug. However, Intricately designed and fine-tuned by experts, Stihl Chainsaws perform to the highest standards.
As previously said, the Stihl chainsaw uses NGK spark plugs. Here you need to ensure you use the correct replacement or cross-reference spark plug while working on a Stihl chainsaw.
Also, take regular care of spark plugs for better results and a longer lifespan. Lastly, if needed, get an expert’s help for any emergency.