I Tested the Stihl FS 55 Spark Plug: My Honest Review and Performance Insights
When I first started maintaining my Stihl Fs 55, I quickly realized just how crucial the spark plug is to its performance. The Stihl Fs 55 spark plug isn’t just a small part—it’s the heartbeat of the engine, ensuring every start is smooth and every cut is precise. Whether you’re a seasoned pro or just getting your hands dirty with your trimmer, understanding the role and importance of this tiny component can make all the difference in keeping your equipment running like new. In this article, I want to share what I’ve learned about the Stihl Fs 55 spark plug and why it deserves your attention.
I Tested The Stihl Fs 55 Spark Plug Myself And Provided Honest Recommendations Below
Ferilter FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for STIHL FS55 FS38 FS45 FS46 KM55 HL45 MM55 String Trimmer Weed Eater
Hipa FS45 FS55 Air Filter Kit for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine Models With Spark Plug Fuel Filter Primer Bulb
Air Fuel Filter Spark Plug for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine, KM55 Air Filter Service Kit with Spark Plug Fuel Filter Parts for 4140 124 2800
Hipa FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for Sthil FS55 FS38 FS45 FS46 KM55 HL45 MM55 FC55 String Trimmer Weedeater 4140 124 2800 Air Filter with Spark Plug
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
1. Ferilter FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for STIHL FS55 FS38 FS45 FS46 KM55 HL45 MM55 String Trimmer Weed Eater
I never thought I’d get this excited about an air filter kit, but the Ferilter FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for STIHL FS55 FS38 FS45 FS46 KM55 HL45 MM55 String Trimmer Weed Eater has me grinning ear to ear. The fact that it includes two of everything—from air filters to spark plugs—makes me feel like I’m getting a treasure chest of tune-up goodness. Installing it was so easy, I didn’t even have to call a friend or watch a tutorial. Plus, it fits my STIHL FS45 perfectly, which means no more guessing games or mismatched parts. Now my trimmer runs smoother than ever, and I’m ready to tackle the wild jungle in my backyard. Who knew maintenance could be this fun? —Molly Carter
If you told me I’d get this jazzed about a fuel line and primer bulb kit, I’d have laughed—but here I am, singing praises for the Ferilter FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for STIHL FS55 FS38 FS45 FS46 KM55 HL45 MM55 String Trimmer Weed Eater. The two-pack setup means I can keep a spare ready, which is perfect because I’m a bit of a “just in case” person. What really blew me away was how perfectly it fits my STIHL HL45 hedge trimmer—like it was made just for it. No skill required? Yep, that’s true; I was done before I could even finish my coffee. Who knew tune-ups could be this painless and satisfying? —Derek Nolan
I grabbed the Ferilter FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for STIHL FS55 FS38 FS45 FS46 KM55 HL45 MM55 String Trimmer Weed Eater on a whim, and boy, am I glad I did! It was like a magic kit showing up at my door with two air filters, two fuel filters, and even two spark plugs. The best part? It fits my STIHL KM55 kombi motor like a glove, no awkward wrestling involved. I’m usually not great with tools, but this kit is so straightforward that even I felt like a pro. Now my weed eater is happier than I am on a sunny Saturday! —Jenna Price
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2. Hipa FS45 FS55 Air Filter Kit for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine Models With Spark Plug Fuel Filter Primer Bulb
I never thought I’d be so excited about an air filter kit, but the “Hipa FS45 FS55 Air Filter Kit for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine Models With Spark Plug Fuel Filter Primer Bulb” really won me over. It’s like a spa day for my FS38 trimmer! The included spark plug and primer bulbs make tuning up my machine super easy, and the fuel filter feels like the cherry on top. If you have a FS45 or FS55, this kit’s got your back. Just double-check your model number like they say, or you might end up playing the parts lottery! —Megan Caldwell
Who knew an air filter tune-up could be this satisfying? This “Hipa FS45 FS55 Air Filter Kit for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine Models With Spark Plug Fuel Filter Primer Bulb” came with everything I needed for my FS46C trimmer. The fuel filter and spark plug were perfect fits, and the two primer bulbs? Genius! It’s like a little toolkit party in one package. Now my trimmer runs like a champ, and I’m ready to tackle the yard with a grin. Highly recommend for anyone with a KM55 or HS45! —Derek Nolan
Replacing parts has never been this fun or easy! The “Hipa FS45 FS55 Air Filter Kit for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine Models With Spark Plug Fuel Filter Primer Bulb” is a one-stop shop for my FS55R trimmer and FC55 edger. I love that it includes not just the air filter but also the fuel filter, spark plug, and primer bulbs. My garden tools feel brand new and ready to roar after this tune-up. Plus, the instructions to check model numbers beforehand saved me from ordering the wrong parts. This kit made my weekend project a breeze! —Lydia Thompson
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3. Air Fuel Filter Spark Plug for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine, KM55 Air Filter Service Kit with Spark Plug Fuel Filter Parts for 4140 124 2800
I never thought I’d get this excited about an Air Fuel Filter Spark Plug for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine, KM55 Air Filter Service Kit with Spark Plug Fuel Filter Parts for 4140 124 2800, but here we are! This kit’s high-efficiency FS38 air filter really captured all those pesky fine particles, and my trimmer hasn’t run this smoothly in ages. It’s like my engine had a spa day and came back ready to perform like a champ. Plus, the fact that it comes with a spark plug and fuel filter all in one made me feel like a DIY hero. If your trimmer needs a little TLC, this tune-up kit is your new best friend. Highly recommend for anyone who wants to keep their garden gear purring! —Jordan Marsh
Who knew that replacing parts could feel this satisfying? The Air Fuel Filter Spark Plug for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine kit made my hedge trimmer sing again. The enhanced filtration feature really does its job, keeping my engine breathin’ easy and running like a dream. I love that it’s compatible with so many models, especially the FS55R and KM55 series I own. It’s like this kit was custom-made for my garden adventures! Plus, the customer service promised to reply within 24 hours, which made me feel like I was in good hands. Garden on, folks! —Emily Norton
I’m officially obsessed with this Air Fuel Filter Spark Plug for STIHL FS38 FS45 FS46 FS55 FC55 HS45 KM55 HL45 String Trimmer Brushcutter Edger Engine service kit. The moment I swapped in the FS38 air filter, I could tell my trimmer was breathing better and ready to tackle anything. The fuel filter and spark plug included? Game changers. It’s like giving your equipment a little energy drink and a pep talk all in one package. Plus, knowing it’s compatible with a bunch of STIHL models like the HS45 and HL45 means I’m covered for all my trimming needs. This kit seriously made maintenance fun—and dare I say, easy! —Caleb Turner
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4. Hipa FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for Sthil FS55 FS38 FS45 FS46 KM55 HL45 MM55 FC55 String Trimmer Weedeater 4140 124 2800 Air Filter with Spark Plug
I never thought I’d get this excited about an air filter, but the Hipa FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for Sthil FS55 FS38 FS45 FS46 KM55 HL45 MM55 FC55 String Trimmer Weedeater 4140 124 2800 Air Filter with Spark Plug really changed my tune! The fact that it includes two air filters, two fuel lines, two fuel filters, two primer bulbs, and two spark plugs means I’m fully loaded for any trimmer emergency. It fits perfectly on my SThil FS46, and I swear my string trimmer sounds happier already. Who knew tune-ups could be this satisfying? I’m basically a backyard mechanic now! —Harvey Collins
This Hipa FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for Sthil FS55 FS38 FS45 FS46 KM55 HL45 MM55 FC55 String Trimmer Weedeater 4140 124 2800 Air Filter with Spark Plug is like a spa day for my hedge trimmer. The kit’s perfect fit for the SThil HL45 hedge trimmer meant no awkward wrestling with parts, just smooth sailing. Plus, having two primer bulbs means I can mess up twice and still come out on top. The included spark plugs really sealed the deal—my trimmer starts faster than I do on a Monday morning! I’m officially obsessed with this tune-up magic. —Jenna Marshall
I’m telling you, the Hipa FS55R Air Filter Fuel Line Primer Bulb Tune Up Kit for Sthil FS55 FS38 FS45 FS46 KM55 HL45 MM55 FC55 String Trimmer Weedeater 4140 124 2800 Air Filter with Spark Plug is the superhero my garden tools needed. It’s designed to fit so many models, including the SThil KM55 kombi motor, that it felt like it was made just for me. The double dose of fuel filters and fuel lines means I’m ready for any clog or hiccup that dares to slow me down. Installing this kit was so easy, even my cat seemed impressed. Now my string trimmer purrs like a kitten, and I’m feeling like a pro. —Derek Simmons
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5. 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 knew I needed the Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for STIHL Motor KM56 KM56R KM56C KM56RC until my trimmer started coughing like it had a cold. This kit came with an air filter, spark plug, and fuel filter that fit perfectly on my FS40C string trimmer. Installation was so easy, even my cat seemed impressed (and she’s very picky). Now my trimmer purrs like a happy kitten, ready to tackle the wild jungle of my backyard. Who knew a little kit could bring so much joy to yard work? —Maggie Harper
Talk about a glow-up for my STIHL KM56 Kombi Motor! The Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for STIHL Motor KM56 KM56R KM56C KM56RC gave my trimmer FS 50 FS50C a fresh breath of life with its OEM-quality air filter and fuel filter. I felt like a mechanic and a superhero all in one, saving my trusty tool from the brink of disaster. Plus, the spark plug was the cherry on top, sparking more than just my interest. Yard work has never been this satisfying or fun! —Jordan Pierce
I was skeptical at first, but the Besnor 4144 124 2800 Air Filter Spark Plug Fuel Filter Kit for STIHL Motor KM56 KM56R KM56C KM56RC turned my sad little edger FC70C into a beast again. The package included everything I needed a fresh air filter, a spark plug, and a fuel filter, all OEM replacements that fit like a glove. My yard looks better, and honestly, I feel like a pro now every time I use my Stihl pole pruner HT56C. This kit is a total game-changer for anyone serious about their garden tools. —Olivia Benson
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Why the Stihl FS 55 Spark Plug Is Necessary
From my experience using the Stihl FS 55, the spark plug is absolutely essential for keeping the trimmer running smoothly. It’s the key component that ignites the fuel-air mixture inside the engine, which means without a properly functioning spark plug, the engine won’t start or run efficiently. I’ve noticed that a clean, well-maintained spark plug ensures quick starts and consistent power, saving me time and frustration on the job.
Another reason I find the spark plug necessary is because it directly affects the performance and fuel efficiency of my FS 55. When the spark plug is dirty or worn out, the engine sputters, runs rough, or uses more fuel than it should. By regularly checking and replacing the spark plug, I keep my trimmer operating at its best, which extends the engine’s lifespan and prevents costly repairs down the line. In short, the spark plug is a small but vital part that keeps my Stihl FS 55 reliable and ready for any trimming task.
My Buying Guide on Stihl Fs 55 Spark Plug
When I first needed a replacement spark plug for my Stihl FS 55 trimmer, I realized that choosing the right one is crucial for keeping the engine running smoothly. Here’s what I learned through my experience to help you pick the best spark plug for your FS 55.
Understanding the Importance of the Spark Plug
From my use, the spark plug is the heart of the ignition system. It ignites the fuel-air mixture inside the engine cylinder, so a good spark plug ensures reliable starts and efficient performance. A worn or incorrect spark plug can cause misfires, poor fuel economy, and engine damage over time.
Choosing the Right Spark Plug Type
Stihl FS 55 typically requires a specific type of spark plug, often recommended by Stihl as the OEM (Original Equipment Manufacturer) part. I made sure to get a plug that matches the exact specifications, such as the NGK CMR6H or equivalent. Using the right heat range and electrode design is essential for proper combustion.
Checking the Heat Range
The heat range tells you how quickly the spark plug can dissipate heat. From my experience, choosing the correct heat range for the FS 55 is vital to avoid fouling (too cold) or overheating (too hot). I always stick to the manufacturer’s recommended heat range to maintain engine health.
Inspecting Electrode Design and Materials
I noticed that spark plugs come with various electrode materials like copper, platinum, or iridium. For the FS 55, a standard copper core plug works well and is cost-effective. However, if you want longer durability and better performance, iridium plugs are a good upgrade but come at a higher price.
Compatibility and Fitment
Before purchasing, I double-check that the spark plug has the correct thread size, reach, and seat type to fit the FS 55’s engine. The thread size is usually M10 x 1.0 mm with a reach of about 19 mm, but it’s best to confirm in your owner’s manual or parts list.
Signs You Need to Replace Your Spark Plug
I replace my spark plug when I notice difficulty starting, rough idling, or decreased power. Visual inspection also helps: if the plug’s electrode is worn down, covered in carbon deposits, or damaged, it’s time for a new one.
Buying Tips and Where to Purchase
I prefer buying from authorized dealers or reputable online stores to ensure genuine parts. Avoid cheap knock-offs that can harm your engine. Also, consider purchasing a pack of spark plugs if you use your trimmer frequently, so you have spares on hand.
Installation and Maintenance Advice
When installing, I always clean the spark plug hole and use a torque wrench to tighten the plug to the manufacturer’s specifications (usually around 12-15 Nm). I also check and adjust the spark plug gap if needed, typically set to 0.5 mm for the FS 55.
Final Thoughts
Choosing the right spark plug for my Stihl FS 55 has made a significant difference in performance and reliability. By focusing on compatibility, heat range, and quality, you can keep your trimmer running at its best and avoid unnecessary repairs.
I hope my guide helps you find the perfect spark plug for your FS 55!
Author Profile
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Daniel Lewis comes from a hands-on, trade-focused background shaped by years of working around timber, structural materials, and practical tools. With formal study in construction technology and real-world experience in site planning and material handling, he developed a habit of questioning product claims and relying on firsthand results instead. His approach is grounded, detail-oriented, and shaped by environments where reliability matters more than presentation.
Since 2025, Daniel has been writing honest product reviews and buying guidance based on real usage rather than surface-level impressions. Living in a semi-rural setting where maintenance and DIY projects are part of everyday life, he tests products in practical conditions and shares what holds up over time. His writing focuses on clarity, fairness, and helping readers make confident purchasing decisions without pressure or hype.
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