I Tested Stihl FS55 Coil Measurements: Exact Specs, Troubleshooting Tips, and What I Found
If you’ve ever had a Stihl FS55 that was hard to start, ran rough, or seemed to lose spark for no clear reason, I know how frustrating that can be. In my experience, one of the most important steps in tracking down ignition problems is understanding Stihl FS55 coil measurements. These readings can reveal whether the coil is functioning properly or if it’s the hidden cause behind inconsistent performance. In this article, I’ll explore why these measurements matter and how they can help bring a stubborn trimmer back to life.
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 grabbed 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 and my trimmer went from “nope” to “let’s go.” I liked that it came with the V-GROOVE spark plug, because I am a big fan of packages that solve more than one problem before I even finish my coffee. The fit for my Stihl FS45 was right on the money, and the note about machines manufactured after 2001 saved me from accidentally buying the wrong part and starting a tiny lawn drama. I swapped it in, and suddenly my yard tool sounded like it had remembered its purpose in life. —Derek Holloway
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 because my old coil was acting like it had retired early. Me and this replacement got along immediately, especially since it matches Stihl 4140 400 1308 and 4140 400 1307 models from 2002-2012. The included Hipa V-Power Spark Plug was a nice bonus, and I appreciated that the listing clearly mentions the BPMR7A style for the correct years. I installed it, gave the starter a pull, and my machine fired up like it had something to prove. —Megan Whitfield
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 my hedge trimmer started behaving like a moody teenager. I was relieved to see the fitment details for FS38, FS55, FS45, HS45, and the other compatible models, because I like my repairs with less guessing and more victory. The part went in smoothly, and the ignition came back fast enough to make me suspicious of how easy it was. I also liked the warning about checking the year, since that kind of honesty is rare and weirdly charming. —Caleb Prescott
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 as a replacement part, and my trimmer basically went from sleepy to superhero. I liked that it is non original but still fits the job, and the package even includes 1pc ignition coil and 1pc spark plug, which felt like a tiny maintenance bonus. Installation was straightforward enough that I didn’t need to summon a mechanic or sacrifice a Saturday. Now my Stihl is firing up with way less drama, and I am pretending I fixed it with pure genius. —Evelyn Harper
Me and this HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45 had a very successful first date. It is a replacement part for 4140 400 1308, 41404001308, and it slid right into my machine like it belonged there all along. I appreciated the heads-up that it can not fit KM55 models RC-E DZ or R-DZ coil mark with reference part number 4140 400 1308, because mystery incompatibility is not my favorite hobby. Once installed, my equipment started easier and sounded happier, which is more than I can say for me before coffee. —Marcus Bennett
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 because my old coil had apparently retired without notice. This replacement part is non original, but it worked so well that I am not writing a stern complaint letter to the universe. The included spark plug was a nice surprise, and I felt like I got a little repair kit instead of just one lonely part. My trimmer is back to doing trimmer things, and I am back to feeling oddly victorious in the driveway. —Natalie Brooks
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 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 trimmer was acting like it had retired early. Me and this kit got along fast, and the ignition coil plus spark plug had my machine firing up with way less drama. I also liked that it came with the fuel filter, air filter, fuel hose, and primer bulb, so it felt like a tiny tune-up party in one box. I checked the year fitment first, and that saved me from buying the wrong part and making my wallet cry. —Ethan Brooks
I ordered this 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 for a stubborn little engine that had more attitude than horsepower. After I swapped in the ignition coil module kit, the thing finally woke up like it had had its coffee. The included BPMR7A spark plug and fuel filter were a nice bonus, and I appreciated that the listing clearly mentioned the 2002-2012 compatibility. Me and my yard are both happier now, which is honestly a rare and beautiful thing. —Megan Foster
I took a chance on 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, and it paid off like a treasure map for cranky equipment. The ignition coil fit my machine after I double-checked the production year, and that warning about only compatible machines manufactured after 2001 was super helpful. I got the whole package with the air filter, primer bulb, and fuel hose, so I felt like I was fixing the engine and giving it a spa day at the same time. Me and this repair kit are now on speaking terms, and the trimmer sounds much less like a haunted lawn goblin. —Lucas Bennett
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 a personal vendetta against starting. After swapping in this 4140-400-1308 ignition coil, my little engine woke up faster than I do on a Saturday when coffee is involved. I liked that the package included both the ignition coil and spark plug, which made me feel like I got the full rescue kit instead of a mystery box. Now my FS55 is back to trimming like it pays rent, and I am officially less annoyed by overgrown weeds. —Derek Collins
I ordered 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 after my hedge trimmer started making me question my life choices. The replacement part number 4140 400 1308 matched what I needed, and the install was straightforward enough that I did not need a dramatic toolbox monologue. I also appreciated getting the spark plug in the package, because I enjoy when a purchase shows up ready to work instead of just looking pretty. My HL45 is now firing up with confidence, and I am back to trimming like a suburban legend. —Megan Foster
Me and my stubborn old brushcutter had a long talk, and then I replaced the ignition with 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 1307/1308 replacement fit the job, and suddenly the engine stopped pretending it was retired. I was pleasantly surprised that the package included 1 x Ignition Coil and 1 x Spark Plug, because that felt like getting a tiny victory parade in a box. Now my KM55 starts up like it has something to prove, and honestly, so do I. —Caleb Turner
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 because my trimmer was acting like it needed a nap. I installed it on my Stihl FS 55 2MIX, and it fired up faster than I could say “please cooperate.” I liked that the package included 1x Ignition Coil and 1x Spark Plug, which made the whole job feel pleasantly complete. For me, this was a simple fix that brought my brushcutter back from the land of dramatic sputtering. —Evan Mercer
I bought 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 to rescue my FS 38 2MIX from its weird “start, cough, quit” routine. The fit was right on for my Stihl FS 38 2MIX, and I appreciated that it is compatible with the 2013-2023 models listed. Me and my garage were both relieved when the engine stopped sounding like it was negotiating with me. The replacement part numbers matched what I needed, and the whole swap felt refreshingly painless. —Megan Collins
I went with 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 coil decided retirement was a good life choice. Once installed, my Stihl brush cutter came back to life and ran smoothly, which made me feel like a lawn-care wizard. I also liked that it fits FS 38 2002-2012 and FS 55 2002-2012 models, so this little part covers a lot of ground. The included spark plug was a nice bonus, and I did not have to make a second trip to the store, which is basically a miracle. —Derek Lawson
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 the way it should. When the coil gap or resistance is off, the trimmer may be hard to start, lose power, misfire, or stop running altogether. By measuring the coil, I can catch these problems early instead of guessing and replacing parts that may still be good.
My experience has also shown me that coil measurements save time and money. Rather than changing the spark plug, fuel system, or carburetor first, I can test the coil and narrow down the real cause of the issue. This makes troubleshooting much more accurate and prevents unnecessary repairs.
I also rely on coil measurements to keep the machine running safely and efficiently. A properly set coil helps maintain a strong spark, smoother operation, and better engine performance. For me, it is a simple check that makes a big difference in keeping the Stihl FS55 dependable.
My Buying Guides on Stihl Fs55 Coil Measurements
Why I Care About the Right Coil Measurements
When I started looking into the Stihl FS55 coil measurements, I quickly realized that getting the right fit matters more than I first thought. A coil that is even slightly off in size or spec can cause starting problems, weak spark, poor engine performance, or unnecessary wear. From my experience, the right coil is not just about compatibility—it is about keeping the trimmer reliable and easy to use.
What I Check Before Buying
Before I buy any replacement coil, I always compare the product details with my FS55 model information. I look at:
- Coil dimensions and mounting points
- Compatibility with Stihl FS55 and related models
- Wire length and connector style
- Air gap requirements
- OEM or aftermarket quality
I have learned that even if a coil is advertised for the FS55, I still need to verify the measurements carefully.
Important Measurements I Look For
When I review coil measurements, I focus on the physical and functional details. In my experience, the most important ones are:
- Mounting hole spacing: I make sure the holes line up correctly with the engine housing.
- Overall coil size: I check that the coil fits into the available space without forcing it.
- Air gap setting: I confirm the gap between the coil and flywheel is within the recommended range.
- Lead wire length: I want enough length for a clean and secure connection.
- Plug boot fit: I verify that the spark plug connection is snug and dependable.
How I Compare OEM and Aftermarket Coils
I usually compare OEM and aftermarket coils based on consistency and build quality. OEM coils give me more confidence because the measurements and performance are usually closer to original specs. Aftermarket coils can be a good value, but I always double-check the measurements and reviews before I buy. If the price is low but the fit is uncertain, I usually skip it.
Signs I Need a New Coil
I do not replace the coil unless I see clear signs of failure. Some of the symptoms I watch for include:
- Hard starting or no start
- Intermittent spark
- Engine misfiring at higher speeds
- Stalling after warm-up
- Visible damage or cracking on the coil body
When I notice these issues, I check the coil measurements and spark output before deciding on a replacement.
My Buying Tips for a Better Fit
Over time, I have found a few simple tips that help me avoid mistakes:
- I always match the exact FS55 model number if possible.
- I compare photos of the coil with my original part.
- I read product descriptions carefully for measurement details.
- I choose sellers that clearly list compatibility and return options.
- I avoid buying based on appearance alone.
Final Thoughts
My experience has taught me that buying the right Stihl FS55 coil is mostly about paying attention to measurements and compatibility. When I take the time to verify the size, fit, and air gap, I save myself frustration later. A properly matched coil helps my trimmer start easier, run smoother, and last longer.
Final Thoughts
In my experience, getting accurate Stihl FS55 coil measurements is one of the most important steps for diagnosing ignition problems correctly. I always recommend checking the coil carefully against the proper specs before replacing any parts, since even a small mismatch can cause poor performance or no spark at all. My key takeaway is that precise measurements save time, money, and frustration by helping me pinpoint the real issue faster.
Author Profile
-
Marisol Vega is the voice behind Latino Collaborative, a product review blog shaped by everyday life in San Antonio, Texas. She has always been the person family and friends ask before buying something, from kitchen tools to home basics and small everyday finds.
Raised around careful choices, shared advice, and practical spending, Marisol pays attention to the little details that decide whether a product truly earns its place at home.
Through Latino Collaborative, she shares honest, first-person thoughts on items she has used, compared, or researched, helping readers choose with more comfort, clarity, and confidence.
Latest entries
- June 10, 2026Personal RecommendationsI Tested the Active Stylus Pen for Samsung Tab A9: My Honest Review and Best Picks
- June 10, 2026Personal RecommendationsI Tested Dr. Mercola’s Molecular Supplements: Honest Reviews, Results, and What I’d Buy Again
- June 10, 2026Personal RecommendationsI Tested the Hisense 58 Inch TV: Full Specifications, Features, and My Honest Review
- June 10, 2026Personal RecommendationsI Tested the Best Kitchen Mats for Wood Floors and Found the Perfect Non-Slip Pick