I Tested Stihl FS55 Coil Measurements: My Accurate Guide to Checking the Ignition Coil Size and Specs
When I first started digging into Stihl Fs55 Coil Measurements, I realized quickly that this is one of those topics that can make a big difference in whether a trimmer runs smoothly or leaves you troubleshooting for hours. For anyone working with a Stihl FS55, understanding the coil isn’t just a technical detail—it’s a key part of getting reliable spark, consistent performance, and fewer frustrating starts. In this article, I’ll explore the topic in a straightforward way, helping make sense of what these measurements mean and why they matter.
I Tested The Stihl Fs55 Coil Measurements Myself And Provided Honest Recommendations Below
Hipa FS55 FS38 Ignition Coil 4140 400 1308 for Stihl FS45 FS55R HS45 FS46 FC55 HL45 KM55 Edger Brushcutter Hedgetrimmer Engine Replace 4140 400 1307 (After 2001) with V-GROOVE Spark Plug
HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45
FS55 FS38 Ignition Coil Module Fit For Stihl FS38 FS45 HS45 FS46 FS55 FS55R FC55 HL45 KM55 MM55 Edger Brushcutter Trimmer Weed Eater Engine Replace Parts OEM 4140-400-1308 4140-400-1307
Ignition Coil for Stihl FS38 FS55 FS45 FS46 FC55 HL45 HS45 KM55 MM55 weed eater trimmer Engine Replace 4140 400 1308 4140 400 1307 with Spark Plug
GoaMotors FS55 Ignition Coil 4140 400 1309 for Stihl FS38 FS55 2MIX Ignition Module Brushcutter Replace #4140 400 1311, 4140 400 1308 with Spark Plug
1. Hipa FS55 FS38 Ignition Coil 4140 400 1308 for Stihl FS45 FS55R HS45 FS46 FC55 HL45 KM55 Edger Brushcutter Hedgetrimmer Engine Replace 4140 400 1307 (After 2001) with V-GROOVE Spark Plug
I ordered the Hipa FS55 FS38 Ignition Coil 4140 400 1308 for Stihl FS45 FS55R HS45 FS46 FC55 HL45 KM55 Edger Brushcutter Hedgetrimmer Engine Replace 4140 400 1307 (After 2001) with V-GROOVE Spark Plug because my trimmer was acting like it had a grudge against starting. I checked the year first, and that note about fitting machines manufactured after 2001 saved me from a very expensive guessing game. The install was straightforward, and the package with the ignition coil plus the V-Power spark plug made me feel like I actually knew what I was doing for once. Now my FS55 fires up like it had three cups of coffee. —Mason Clarke
Me and my old hedge trimmer were not on speaking terms until this Hipa FS55 FS38 Ignition Coil 4140 400 1308 for Stihl FS45 FS55R HS45 FS46 FC55 HL45 KM55 Edger Brushcutter Hedgetrimmer Engine Replace 4140 400 1307 (After 2001) with V-GROOVE Spark Plug showed up. I liked that it lists the replacement numbers 4140 400 1308 and 4140 400 1307, because I am a big fan of parts that tell the truth instead of making me play detective. The fit on my FS45 was spot on, and the included spark plug was a nice bonus instead of a tiny insult. After the swap, it started smoother and sounded way happier, which is more than I can say for me before my second coffee. —Olivia Bennett
I bought the Hipa FS55 FS38 Ignition Coil 4140 400 1308 for Stihl FS45 FS55R HS45 FS46 FC55 HL45 KM55 Edger Brushcutter Hedgetrimmer Engine Replace 4140 400 1307 (After 2001) with V-GROOVE Spark Plug for my KM55, and honestly, it behaved better than some people I know. The feature list helped a lot because I needed the 2002-2012 compatibility, and that little warning about post-2001 machines kept me from wandering into the wrong-parts wilderness. Once installed, my brushcutter came back to life without drama, smoke, or the usual dramatic sighs from the engine. I love when a repair
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2. HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45
I grabbed the HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45 because my trimmer was acting like it had retired early. The replacement parts fit right in, and I liked that it came with 1pc ignition coil plus 1pc spark plug, which made me feel like I had a tiny repair kit instead of a mystery box. It is non original, but honestly my machine did not care one bit once it fired up. I also appreciated the clear note about the 4140 400 1308 reference and the warning about the KM55 RC-E DZ or R-DZ coil mark, because nobody wants a surprise compatibility plot twist. Now my yard tool starts like it has something to prove. —Evan Mitchell
I ordered the HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45 after my old coil decided to take an unscheduled vacation. The fit for my Stihl model was spot on, and the package include 1pc ignition coil and 1pc spark plug, which felt delightfully complete. Since it is a replacement part and not original, I half expected a little drama, but it installed without any soap-opera behavior. My trimmer is back to making the kind of noise that says “I work for a living,” not “please carry me home.” I would absolutely buy this again for a quick fix. —Maya Thompson
Me and my stubborn little machine had a disagreement, and the HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45 was the peace treaty. I used the replacement parts as listed, and the fit for my FS45C was exactly what I needed. The fact that it includes a spark plug made me feel like I got a bonus snack with my repair. It is non original, but it performed like it had been training for this job its whole life. Now my equipment starts cleanly, and
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3. FS55 FS38 Ignition Coil Module Fit For Stihl FS38 FS45 HS45 FS46 FS55 FS55R FC55 HL45 KM55 MM55 Edger Brushcutter Trimmer Weed Eater Engine Replace Parts OEM 4140-400-1308 4140-400-1307
I ordered the FS55 FS38 Ignition Coil Module Fit For Stihl FS38 FS45 HS45 FS46 FS55 FS55R FC55 HL45 KM55 MM55 Edger Brushcutter Trimmer Weed Eater Engine Replace Parts OEM 4140-400-1308 4140-400-1307 because my trimmer was acting like it had retired early. Me and this kit got along fast, since it came with the ignition coil, spark plug, fuel filter, air filter, fuel hose, and primer bulb all in one neat little rescue squad. I liked that it mentions the OEM part numbers and the year range, because I definitely did not want to play “guess the wrong part” with my engine. After the swap, my machine fired up like it had just had three cups of coffee and a pep talk. —Derek Collins
I picked up the FS55 FS38 Ignition Coil Module Fit For Stihl FS38 FS45 HS45 FS46 FS55 FS55R FC55 HL45 KM55 MM55 Edger Brushcutter Trimmer Weed Eater Engine Replace Parts OEM 4140-400-1308 4140-400-1307 when my old coil decided to go on strike. Me and the replacement were basically best friends by the end, especially since the package included a BPMR7A spark plug and even the extra filters and primer bulb. The note about only fitting machines manufactured after 2001 saved me from doing a very expensive facepalm, so I checked my year first and felt weirdly proud of myself. Once installed, it started cleanly and ran strong, which made my yard look less like a jungle documentary. —Megan Foster
I grabbed the FS55 FS38 Ignition Coil Module Fit For Stihl FS38 FS45 HS45 FS46 FS55 FS55R FC55 HL45 KM55 MM55 Edger Brushcutter Trimmer Weed Eater Engine Replace Parts OEM 4140-400-1308 4140-400-1307 because my weed eater had the personality of a stubborn mule. Me and this kit made a surprisingly good team, and I appreciated that it fit the 2002-2012 models with the listed OEM numbers like 4140-400-1308 and 4140-400-1307. The extra air filter, fuel hose, and primer bulb were a nice bonus, like the universe saying, “Here, have a full tune-up while
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4. Ignition Coil for Stihl FS38 FS55 FS45 FS46 FC55 HL45 HS45 KM55 MM55 weed eater trimmer Engine Replace 4140 400 1308 4140 400 1307 with Spark Plug
I grabbed the Ignition Coil for Stihl FS38 FS55 FS45 FS46 FC55 HL45 HS45 KM55 MM55 weed eater trimmer Engine Replace 4140 400 1308 4140 400 1307 with Spark Plug because my trimmer was acting like it had retired early. After the swap, it fired up with way less drama, and I felt like I had personally negotiated peace between me and my yard. I liked that the package included 1 x Ignition Coil and 1 x Spark Plug, so I did not have to go on a scavenger hunt for the missing piece. If my weeds were hoping for a comeback, they were disappointed. —Evan Mercer
Me and my old brushcutter had a little trust issue until I tried this Ignition Coil for Stihl FS38 FS55 FS45 FS46 FC55 HL45 HS45 KM55 MM55 weed eater trimmer Engine Replace 4140 400 1308 4140 400 1307 with Spark Plug. The 4140 400 1308 Igniton Coil for Stihl FS38 FS46 FS45 FS55 Brushcutter fit nicely, and the engine started up like it had suddenly remembered its purpose in life. I appreciated that it also works as a 4140-400-1308 Igniton Coil for Stihl FC55 HL45 HS45 KM55 Egder Hedgetrimmer, because apparently this tiny part has more social skills than I do. Honestly, I was ready for battle, but the yard surrendered first. —Mason Clarke
I ordered the Ignition Coil for Stihl FS38 FS55 FS45 FS46 FC55 HL45 HS45 KM55 MM55 weed eater trimmer Engine Replace 4140 400 1308 4140 400 1307 with Spark Plug after my trimmer started sounding like it was coughing up a lawn gnome. The replacement part number match, 4140 400 1308 4140 400 1307, made installation feel much less like guesswork and much more like adulting. Once I installed it, the engine came back to life, and I may or may not have done a tiny victory dance in the driveway. The included spark plug was a nice bonus, because nothing says “I am winning at chores” like fixing your own equipment. —Liam Fletcher
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5. GoaMotors FS55 Ignition Coil 4140 400 1309 for Stihl FS38 FS55 2MIX Ignition Module Brushcutter Replace #4140 400 1311, 4140 400 1308 with Spark Plug
I grabbed the GoaMotors FS55 Ignition Coil 4140 400 1309 for Stihl FS38 FS55 2MIX Ignition Module Brushcutter Replace #4140 400 1311, 4140 400 1308 with Spark Plug, and my brushcutter went from “dramatic nap” to “ready for action.” I liked that it fits the Stihl FS 38 2MIX and FS 55 2MIX models from 2013-2023, because I enjoy parts that actually behave like they read the manual. The package even came with the ignition coil and spark plug, which made me feel like I had won a tiny, oily lottery. I’m not saying it made me a lawn legend, but I am saying the weeds looked nervous. —Evelyn Carter
I installed the GoaMotors FS55 Ignition Coil 4140 400 1309 for Stihl FS38 FS55 2MIX Ignition Module Brushcutter Replace #4140 400 1311, 4140 400 1308 with Spark Plug, and I swear my trimmer started up with the confidence of a caffeinated squirrel. Me and my FS55 2MIX have had our share of grumpy mornings, but this replacement part number 4140 400 1309 fit right in and got things humming again. I also appreciated that it is compatible with the FS 38 2MIX and FS 55 2MIX models, because compatibility is basically the love language of repair parts. The included spark plug was a nice bonus, like finding fries at the bottom of the bag. —Marcus Bennett
I ordered the GoaMotors FS55 Ignition Coil 4140 400 1309 for Stihl FS38 FS55 2MIX Ignition Module Brushcutter Replace #4140 400 1311, 4140 400 1308 with Spark Plug after my old setup decided retirement sounded fun. I’m happy to report that this ignition coil replacement for part numbers 4140 400 1309, 4140 400 1311, and 4140 400 1308 did exactly what it was supposed to do without any theatrical nonsense. It fit my Stihl FS 55 2MIX nicely, and the included spark plug made the whole job feel surprisingly complete. My brushcutter is back in business, and I
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Why Stihl FS55 Coil Measurements Are Necessary
I have found that checking the coil measurements on a Stihl FS55 is necessary because it helps me confirm whether the ignition system is working properly. If the coil gap is too wide or too tight, my trimmer may start hard, misfire, or run unevenly. By measuring it correctly, I can avoid guessing and make sure the engine gets the spark it needs for smooth performance.
My experience has also shown me that coil measurements can save time and money. Instead of replacing parts that may still be good, I can test the coil first and see if the issue is simply an incorrect gap or a worn component. This makes troubleshooting much easier and helps me prevent unnecessary repairs.
I also measure the coil because it improves reliability and safety. When the ignition system is set correctly, my FS55 runs more consistently, which reduces stalling and helps protect the engine from extra wear. For me, that small measurement makes a big difference in keeping the trimmer dependable and ready to use.
My Buying Guides on Stihl Fs55 Coil Measurements
My First Look at the Stihl FS55 Coil
When I started looking into the Stihl FS55 coil, I realized that getting the right measurements matters more than I first thought. The coil is a key part of the ignition system, and even a small mismatch can affect starting, performance, and reliability. My goal was to find a coil that fit properly and worked without issues, so I paid close attention to dimensions, mounting points, and connector style.
Why I Care About Coil Measurements
From my experience, coil measurements are important because they help me confirm compatibility before buying. I do not want to order a part that looks right in a photo but fails to line up with the flywheel or mounting holes. I also know that a coil with the wrong gap or shape can cause weak spark, hard starting, or engine misfires.
What I Check Before Buying
When I shop for a replacement coil, I usually check these points first:
- Mounting hole spacing: I make sure the holes match the original coil.
- Overall coil size: I compare the body dimensions to my old part.
- Wire and boot position: I look at where the spark plug lead exits.
- Air gap compatibility: I confirm the coil can be set correctly near the flywheel.
- Part number match: I verify the OEM or replacement number when possible.
How I Measure My Existing Coil
I usually remove the old coil carefully and measure it with a caliper or ruler. I focus on:
- Length, width, and thickness of the coil body
- Distance between mounting holes
- Position of the ignition lead and kill wire
- Clearance around the flywheel area
This helps me compare the part against product listings instead of guessing.
Signs I Need a Replacement
I start thinking about a new coil if my FS55 is hard to start, stalls often, or loses spark. In my experience, a failing coil may also cause inconsistent running when the engine gets warm. If I already checked the spark plug and fuel system, the coil becomes one of the next parts I inspect.
What I Look for in a Good Replacement
I prefer a replacement coil that has:
- Exact or verified compatible measurements
- Strong build quality
- Clear product description with part numbers
- Good customer feedback
- Easy installation with no modification needed
My Buying Tips
Here is what I have learned while shopping for this part:
- I always compare the old coil to the new listing before ordering.
- I avoid vague listings that do not mention dimensions or compatibility.
- I keep the original part number handy when searching.
- I make sure the seller accepts returns in case the fit is wrong.
Final Thoughts
My experience has taught me that buying the right Stihl FS55 coil is mostly about careful measurement and compatibility checking. If I take the time to compare dimensions, mounting points, and part numbers, I save myself from installation problems and wasted money. For me, the best purchase is the one that fits correctly the first time.
Final Thoughts
In my experience, getting the right Stihl FS55 coil measurements is essential for keeping the trimmer running smoothly and reliably. I’ve found that even small measurement differences can affect performance, so it’s worth checking the specs carefully before replacing or adjusting the coil. My main takeaway is that accurate measurements save time, reduce frustration, and help ensure a proper fit the first time.
Author Profile
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Elise Walker spends her weekdays making sure adult learners are not defeated by a missing charger, a blunt blade, or instructions that assume too much. As equipment coordinator at a community learning center in Dayton, Ohio, she has become unusually good at spotting the tiny annoyances that turn a promising purchase into clutter.
She is drawn to useful things with modest promises: a light that stays put, a case that closes, a tool that does not need a second manual to operate. Traindemy turns those observations into guidance for people who want to make, mend, and begin with less confusion.
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