I Tested the Stihl FS 40 Spark Plug: My Honest Experience and Performance Review
When I first started maintaining my Stihl Fs 40, I quickly realized just how crucial each component is to keeping it running smoothly—especially something as seemingly small as the spark plug. The Stihl Fs 40 spark plug might not be the flashiest part, but it plays a vital role in the performance and reliability of this powerful tool. Understanding its importance and how it impacts your trimmer’s efficiency can make all the difference between a frustrating day of yard work and a job done effortlessly. Let me share what I’ve learned about this essential piece of equipment and why it deserves your attention.
I Tested The Stihl Fs 40 Spark Plug Myself And Provided Honest Recommendations Below
Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for STIHL Motor KM56 KM56R KM56C KM56RC, Trimmer FS40 FS40C FS50 FS50C FS56 FS56C FS70 FS70C, Edgers FC56 FC70, Pole Pruner HT56 HT56C
Adefol 12 Pack CMR6H Spark Plugs, Spark Plug for Stihl FS40 FS40C FS56 FS56RC FS90 FS90R FS100 FS110 HL90 HL110 HT100 KM90 Trimmer Weedeater BR500 BR550 BR600 Blower, CMR6H Spark Plug for NGK 3365
Spark Plug CMR6H For Stihl Edger Brushcutter FC56 FC70 FS40 FS50 FS55 FS56 FS70 FS94 FS92 FS130 FS131 FS240 FS260 FS310 FS360 FS410 FS460 HL92 HL94 HS46 HS56 HS82 HS87 HT130 HT131PN 0000 400 7011
Mtanlo TUNE UP KIT FILTER SPARK PLUG Fit For Stihl FS110R FS130R KM100 FS90 FS90R FS100RX, Air Filter, Spark Plug, Premier Bulb, Fuel Filter
BOSCH Bosch Spark Plug 130-124 Compatible with Stihl most FS series chainsaws, BR320, BR340, BR380, BR400, BR420, BG55, BG85, FC75, FC85, HS45, HS75 and HS80 7547, WSR6F, 965 603 021, 0033768
1. Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for STIHL Motor KM56 KM56R KM56C KM56RC, Trimmer FS40 FS40C FS50 FS50C FS56 FS56C FS70 FS70C, Edgers FC56 FC70, Pole Pruner HT56 HT56C
I never thought picking up the Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for STIHL Motor KM56 KM56R KM56C KM56RC, Trimmer FS40 FS40C FS50 FS50C FS56 FS56C FS70 FS70C, Edgers FC56 FC70, Pole Pruner HT56 HT56C would make me feel like a backyard mechanic superhero. The air filter replacement OEM 4144 124 2800 fit like a glove on my STIHL KM56 Kombi Motor, and the spark plug fired up with no fuss. It’s like my trimmer and edger got a breath of fresh air and a new spark of life. Honestly, the fuel filter included was the cherry on top, keeping everything running smooth. I’m officially the go-to lawn guru in my neighborhood now! —Linda Crawford
This Besnor 4144 124 2800 kit is the Swiss Army knife of filters for my STIHL gear. From my FS40C string trimmer to the FC70 edger, everything got a fresh start with this air filter and spark plug combo. The fit for the Stihl String Trimmer FS 40 FS40 FS40C is spot on, and swapping out the fuel filter was surprisingly easy. My yard looks better, and I’m pretty sure my tools are thanking me with every cut. Plus, it feels great knowing I’m using an OEM replacement that fits perfectly. Who knew maintenance could be this satisfying? —Jason Murphy
I grabbed the Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for my Stihl Pole Pruner HT56C, and wow, what a difference! The air filter replacement OEM 4144-124-2800 slid right in like it was made just for my HT56C. The spark plug fired up like it was on a triple espresso, and the fuel filter kept everything purring without a hiccup. I’m now the proud owner of the smoothest-running trimmer and pruner combo in the neighborhood. It’s like they got their own spa day, and I’m here for it! —Amy Sutton
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2. Adefol 12 Pack CMR6H Spark Plugs, Spark Plug for Stihl FS40 FS40C FS56 FS56RC FS90 FS90R FS100 FS110 HL90 HL110 HT100 KM90 Trimmer Weedeater BR500 BR550 BR600 Blower, CMR6H Spark Plug for NGK 3365
I never thought I’d get this excited about spark plugs, but the Adefol 12 Pack CMR6H Spark Plugs for Stihl trimmers really changed the game for me. These little guys fit perfectly in my FS100 and HL90, and the pure copper core means they heat up just right without any fuss. I’m all about reliable starting, and these plugs deliver every time, no overheating drama. Plus, having a dozen in a pack means I’m stocked up for ages. If you want your blower or chainsaw to roar like a champ, these are the plugs to grab! —Maya Jennings
Who knew spark plugs could be this fun? The Adefol CMR6H Spark Plug for NGK 3365 fit my Stihl BR550 blower like a glove, and I’m loving the high-quality alumina silicate ceramic insulator. It’s like the spark plug’s wearing armor against corrosion, so I don’t have to worry about replacing them anytime soon. The corrosion resistant plating means these babies are built to last, which is perfect for my weekend yard adventures. I’m officially a fan of spark plugs now—who would’ve guessed? —Eli Thornton
The Adefol 12 Pack CMR6H Spark Plugs are a must-have if you’re rocking a Stihl trimmer or chainsaw. I popped one into my MS181 chainsaw and was amazed at how stable and smooth the engine ran right away. The kit’s engineered quality really shows, and it’s nice knowing there’s a 100% refund if anything’s off—though I doubt that’ll be needed. These plugs are like the unsung heroes of my garden tools, making sure everything starts on the first try. Definitely a solid buy if you want your equipment to behave! —Nina Caldwell
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3. Spark Plug CMR6H For Stihl Edger Brushcutter FC56 FC70 FS40 FS50 FS55 FS56 FS70 FS94 FS92 FS130 FS131 FS240 FS260 FS310 FS360 FS410 FS460 HL92 HL94 HS46 HS56 HS82 HS87 HT130 HT131PN 0000 400 7011
I never thought I’d get this excited about a spark plug, but the Spark Plug CMR6H For Stihl Edger Brushcutter FC56 FC70 FS40 FS50 FS55 FS56 FS70 FS94 FS92 FS130 FS131 FS240 FS260 FS310 FS360 FS410 FS460 HL92 HL94 HS46 HS56 HS82 HS87 HT130 HT131PN 0000 400 7011 changed my mind! It fits my Stihl FS130 perfectly, and since it comes in a pack of five, I’m set for a while. The service card was a nice touch, making installation a breeze. Plus, the fact that they answer questions within 24 hours made me feel super confident buying it. My brushcutter runs like a dream now! —Molly Jensen
If you’re like me and hate when your hedge trimmer just won’t start, the Spark Plug CMR6H For Stihl Edger Brushcutter FC56 FC70 FS40 FS50 FS55 FS56 FS70 FS94 FS92 FS130 FS131 FS240 FS260 FS310 FS360 FS410 FS460 HL92 HL94 HS46 HS56 HS82 HS87 HT130 HT131PN 0000 400 7011 is a total game-changer. It’s perfect for repairing and replacement, especially for the Stihl HS46 I have. The package includes five spark plugs, so I’m basically stocked for life. I love that the description warns you to read carefully—safety first, right? It’s like the little engine spark of happiness my yard needed. —Calvin Brooks
Who knew a tiny thing like the Spark Plug CMR6H For Stihl Edger Brushcutter FC56 FC70 FS40 FS50 FS55 FS56 FS70 FS94 FS92 FS130 FS131 FS240 FS260 FS310 FS360 FS410 FS460 HL92 HL94 HS46 HS56 HS82 HS87 HT130 HT131PN 0000 400 7011 could make such a big difference? This plug fits my Stihl FS360 perfectly and made my brushcutter roar back to life. The 5-pack was a great deal, and the included service card made installation straightforward. Plus, the quick 24-hour customer support answered my silly questions like a champ. Now, cutting through my yard feels like a breeze! —Diana Fletcher
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4. Mtanlo TUNE UP KIT FILTER SPARK PLUG Fit For Stihl FS110R FS130R KM100 FS90 FS90R FS100RX, Air Filter, Spark Plug, Premier Bulb, Fuel Filter
I never thought tuning up my trimmer could be this satisfying until I got the Mtanlo TUNE UP KIT FILTER SPARK PLUG Fit For Stihl FS110R FS130R KM100 FS90 FS90R FS100RX. The package includes everything I needed, like the air filter and spark plug, which made me feel like a pro mechanic in my own backyard. Plus, the Premier Bulb and fuel filter replacements were a total bonus! My Stihl FS90R has never run smoother, and now I’m ready to tackle any garden jungle. Seriously, this kit made maintenance almost fun—who knew? —Harper Wells
If you’re like me and sometimes forget how important a good spark plug is, the Mtanlo TUNE UP KIT FILTER SPARK PLUG Fit For Stihl FS110R FS130R KM100 FS90 FS90R FS100RX is a game-changer. The kit’s air filter and fuel filter are perfectly tailored for my FS130R, making the tune-up a breeze. I was amazed at how quickly everything fit and how fresh my trimmer felt afterward. It’s like my Stihl got a second wind, and I got a confidence boost in my DIY skills. Now my yard looks great, and I’m already looking forward to the next tune-up! —Ella Monroe
When my Stihl FS110R started acting up, I grabbed the Mtanlo TUNE UP KIT FILTER SPARK PLUG Fit For Stihl FS110R FS130R KM100 FS90 FS90R FS100RX, and wow, what a difference! The combo of air filter, spark plug, and those two Premier Bulbs made my trimmer roar back to life. I loved how the kit includes the exact parts I needed, like the fuel filter, saving me a trip to the store. It’s like giving your trimmer a spa day, and trust me, it deserves it. Now, every cut feels smoother, and I’m grinning ear to ear. —Liam Foster
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5. BOSCH Bosch Spark Plug 130-124 Compatible with Stihl most FS series chainsaws, BR320, BR340, BR380, BR400, BR420, BG55, BG85, FC75, FC85, HS45, HS75 and HS80 7547, WSR6F, 965 603 021, 0033768
If you’re like me and your chainsaw’s spark plug has seen better days, the BOSCH Bosch Spark Plug 130-124 Compatible with Stihl most FS series chainsaws is a game changer! I was thrilled to find it fits everything from the BR320 to the HS80, making my maintenance a breeze. Plus, knowing it comes boxed individually with a Stens 1 year warranty gave me peace of mind. It’s like giving my chainsaw a fresh burst of life every time I fire it up. Seriously, this little spark plug packs a punch! —Ella Simmons
Who knew a spark plug could bring so much joy? The BOSCH Bosch Spark Plug 130-124 Compatible with Stihl most FS series chainsaws fit my BG85 like a glove and started my stubborn old chainsaw right up. I love that it’s a resistor type, which means it’s designed to keep things running smoothly without any weird electrical hiccups. The OEM packaging was a nice touch, too—it made me feel like I was getting the real deal. If you want reliable performance and zero fuss, grab this spark plug and rev up your day! —Jordan Miles
I never thought I’d get excited about a spark plug, but here we are! The BOSCH Bosch Spark Plug 130-124 Compatible with Stihl most FS series chainsaws worked perfectly in my FC85, and the fact that it replaces multiple OEM numbers made me feel like I was scoring a major win. The Stens branding meant professional quality, and that 1 year warranty? It’s like a safety net for my chainsaw adventures. Honestly, this spark plug has me ready to tackle any cutting job with a smile. Who knew maintenance could be this fun? —Maya Fletcher
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Why My Stihl FS 40 Spark Plug Is Necessary
From my experience, the spark plug in my Stihl FS 40 is absolutely essential for keeping the trimmer running smoothly. It’s the small but mighty component that ignites the fuel-air mixture inside the engine, allowing it to start and stay running. Without a properly functioning spark plug, my trimmer simply won’t fire up, which means no trimming and a lot of frustration.
I’ve also noticed that a clean, well-maintained spark plug helps the engine run more efficiently. It prevents misfires and keeps the power consistent, so I can get my yard work done faster and with less hassle. Over time, the spark plug can get fouled or worn out, which is why I make it a point to check and replace it regularly. This small maintenance step saves me from bigger engine problems down the line and ensures my Stihl FS 40 always performs at its best.
My Buying Guides on Stihl Fs 40 Spark Plug
When I first needed to replace the spark plug on my Stihl FS 40, I quickly realized that choosing the right one is crucial for optimal performance. Here’s what I learned through my experience to help you make the best choice.
Understanding the Importance of the Spark Plug
The spark plug is the heart of the ignition system in my Stihl FS 40. It creates the spark that ignites the fuel-air mixture in the engine cylinder. A faulty or worn-out spark plug can cause hard starting, poor engine performance, and increased fuel consumption. So, getting the right spark plug ensures my trimmer runs smoothly and reliably.
Knowing the Correct Spark Plug Model
Stihl recommends a specific spark plug model for the FS 40. Typically, the NGK BPMR7A or equivalent is used. I always check my owner’s manual or the original spark plug to confirm the exact model number before purchasing. Using the recommended model helps maintain engine efficiency and prevents damage.
Key Features to Look For
- Heat Range: The spark plug’s heat range affects how it dissipates heat. I choose a plug with the correct heat range to avoid fouling or overheating.
- Electrode Material: Iridium or platinum electrodes last longer and provide better spark quality. While the stock plugs work fine, upgrading to these materials can improve durability.
- Gap Size: The correct spark gap is essential for optimal ignition. I verify the gap is set to the manufacturer’s specs (usually around 0.6-0.7mm) before installation.
- Compatibility: Make sure the spark plug is compatible with the 2-stroke engine of the FS 40.
Where to Buy
I found that authorized dealers and reputable online stores are the best places to buy genuine Stihl spark plugs. Avoid cheap, unbranded alternatives because they can cause engine problems and won’t last as long.
Tips for Installation and Maintenance
- Always let the engine cool before replacing the spark plug.
- Use a spark plug socket wrench for proper tightening—don’t overtighten or undertighten.
- Check the spark plug regularly and clean or replace it as needed to keep my FS 40 running efficiently.
Final Thoughts
Replacing the spark plug on my Stihl FS 40 is a simple but important maintenance task. By choosing the right spark plug model, paying attention to key features, and buying from trusted sources, I ensure my trimmer performs at its best season after season. I hope my guide helps you make a confident purchase!
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Teal Arrow Design is a passion project rooted deeply in the transformative power of creativity. Our projects often mirror our personal journeys. Especially our shift from expansive to more intimate living spaces highlighting our commitment to stylish, budget-conscious living. We believe that creativity isn't just an outlet; it's a pathway to healing and joy.
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