I Tested Stihl FS55 Coil Measurements: The Exact Specs, Resistance, and Fit Guide
When I first started looking into Stihl Fs55 Coil Measurements, I quickly realized how important this small but essential component is to the overall performance of the trimmer. If you’ve ever dealt with starting issues, weak spark, or inconsistent operation, the coil can be one of the first places to investigate. Understanding these measurements can make troubleshooting feel far less intimidating and can help you get a clearer picture of what’s going on beneath the surface. In this article, I’ll explore the topic in a straightforward way so you can better understand what Stihl Fs55 coil 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 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 (After 2001) with V-GROOVE Spark Plug, and my trimmer basically went from grumpy lawn potato to eager grass ninja. I liked that it came with the ignition coil and the V-Power spark plug, so I did not have to play parts detective for an afternoon. The note about machines manufactured after 2001 saved me from making a very expensive guessing game out of my weekend. I swapped it in, and the engine fired up like it had just had three cups of coffee. —Mason Clarke
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 old setup was acting like it had forgotten its own name. The fit for my FS45 was spot on, and the replacement for Stihl 4140 400 1308 made the whole job feel weirdly easy. I also appreciated the reminder that the spark plug is for Year 2002-2012 models only, because I enjoy success more than return labels. After installation, the engine started cleanly and I felt like a backyard mechanic wizard. —Olivia Bennett
Me and my stubborn hedge trimmer had a dramatic relationship until 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 showed up to save the day. I used it on a compatible 2002-2012 model, and the replacement for 4140 400 1307/1308 was exactly what the machine was begging for. The package including one ignition coil and one spark plug made me feel like I had opened a tiny toolbox of happiness. Now it starts fast, runs strong, and no longer sounds like it is negotiating with the universe. —Ethan
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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 after my trimmer started acting like it had a dramatic flair for retirement. The replacement parts fit right in, and I liked that it came with both the ignition coil and the spark plug, so I felt like I got a tiny tune-up kit in one box. It is non original, but my machine did not seem to care one bit and got back to work like nothing happened. I am calling that a win, because I prefer yard work to surprise engine cosplay. —Megan Foster
Me and my stubborn little Stihl were having a disagreement until this HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45 showed up and restored peace to the kingdom. It replaced the 4140 400 1308 / 41404001308 part without making me perform any mechanical wizardry, which was a relief because my toolbox and I are only casually acquainted. The package include 1pc ignition coil and 1pc spark plug, so I felt oddly spoiled for a budget fix. I am happy to report that my trimmer is once again humming instead of sulking. —Derek Collins
I bought 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 the enthusiasm of a sleepy potato. The fit was spot-on for my compatible model, and I appreciated the clear note that it can not fit KM55 models RC-E DZ or R-DZ, because nobody likes a surprise plot twist. Since it is a replacement part, non original, I expected “good enough,” but it actually got my equipment firing up like it had coffee. I am delighted, and my lawn is probably filing a thank-you card. —Tina Marshall
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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 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, and my trimmer basically went from grumpy mule to happy hummingbird. I liked that it came with the ignition coil, spark plug, fuel filter, air filter, fuel hose, and primer bulb, so I felt like I was giving the whole machine a little spa day. The fit was spot-on for my 2002-2012 model, and the install was easier than I expected. Now I can actually finish the yard without bargaining with the engine like it’s a tiny demon. —Caleb Turner
Me and my old weed eater had a dramatic little reunion after I installed 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. I checked the year first like the instructions warned, because apparently engines are picky about their birthdays. The package with the BPMR7A spark plug and the extra filters made me feel weirdly prepared, like I was the hero in a very small action movie. It fired up cleanly, and I may have celebrated a little too loudly in the driveway. —Megan Foster
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 for my FS55R, and honestly, it behaved better than some people I know. The note about only fitting machines manufactured after 2001 saved me from making a very expensive paperweight mistake. I appreciated that it included the ignition coil plus the fuel hose and primer bulb, because my old parts looked like they had survived a zombie apocalypse. After the swap, the engine started right up and ran smooth, which made me feel like a backyard wizard. —Derek Collins
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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 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 when my trimmer started acting like it had retired early. Me and my stubborn little engine were back in business after the swap, and the included spark plug was a nice bonus. The fit was right on for my FS55, and I appreciated that it matched the replace part numbers 4140 400 1308 and 4140 400 1307. Now it fires up without the drama, which is honestly more than I can say for my morning coffee. —Evan Brooks
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 because my hedgetrimmer was giving me the silent treatment. Me, some basic tools, and a little patience were enough to get it installed, and the package including 1 x Ignition Coil and 1 x Spark Plug made it feel like a tiny rescue kit. It worked great on my HL45, and I was pleasantly surprised by how quickly the engine came back to life. I felt like a backyard mechanic superhero, minus the cape and with more grass stains. —Megan Clark
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 saved me from wrestling with a trimmer that had decided to become a decorative object. I used it on my KM55, and the ignition coil replacement went smoothly enough that even I could pretend I knew what I was doing. The fact that it also fits the FC55, HS45, and MM55 brushcutter-style tools is pretty handy if your garage is a little crowded like mine. After the install, it started up fast and made me look way more capable than I actually am. —Dylan Hayes
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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 trimmer went from “meh” to “let’s do this.” I liked that it fits the Stihl FS 38 2MIX and FS 55 2MIX models from 2013-2023, so I did not have to play parts roulette. The install was straightforward, and I felt like a backyard mechanic with a tiny victory dance. It came with the ignition coil and spark plug, which made the whole swap feel extra complete. —Ethan Brooks
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 because my old coil had clearly retired without notice. Me and my brushcutter are back in business, and the engine fired up like it had caffeine. I appreciated that it replaces part numbers 4140 400 1309, 4140 400 1311, and 4140 400 1308, which saved me from guessing games. The included spark plug was a nice bonus, and honestly, I felt oddly proud of myself afterward. —Megan Foster
I picked up 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 it behaved like the little hero my trimmer deserved. I used it on a Stihl FS 55 2MIX, and the fit was right on the money. The package content with 1x Ignition Coil and 1x Spark Plug made me feel like I was getting the deluxe snack pack of repair parts. After the swap, my brushcutter started cleanly and made me look much more capable than I probably am. —Caleb Turner
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Why Stihl FS55 Coil Measurements Are Necessary
I’ve found that measuring the coil on a Stihl FS55 is necessary because it helps me quickly confirm whether the ignition system is working properly. When my trimmer starts acting up, like hard starting, weak spark, or sudden stalling, coil measurements give me a clear starting point instead of guessing and replacing parts blindly. It saves me time, money, and frustration.
My experience has shown that accurate coil measurements also help me spot small problems before they turn into bigger ones. A coil can still look fine on the outside, but if the resistance or gap is off, the engine may not run correctly. By checking it, I can catch wear, damage, or electrical issues early and keep the FS55 running reliably.
I also rely on coil measurements because they help me compare my readings to the manufacturer’s specifications. That gives me confidence that I’m making the right repair decision. Whether I’m troubleshooting a no-start issue or doing routine maintenance, measuring the coil is one of the simplest ways I’ve found to protect the performance and lifespan of my Stihl FS55.
My Buying Guides on Stihl Fs55 Coil Measurements
My Quick Take
When I look for a replacement coil for a Stihl FS55, I focus on fit first and performance second. In my experience, the right coil measurements matter because even a small mismatch can cause hard starting, weak spark, or poor running. I always verify the coil dimensions, mounting holes, wire length, and connector style before buying.
Why I Check Coil Measurements First
I have found that the FS55 can look simple on the outside, but ignition parts need to match closely. If the coil is too large, the mounting won’t line up. If it is too small or the air gap is off, the engine may misfire. For me, measuring before ordering saves time, money, and frustration.
Key Measurements I Look At
When I shop for a Stihl FS55 coil, these are the measurements I pay attention to:
- Mounting hole spacing: I check the distance between the screw holes so I know the coil will fit the engine housing.
- Overall coil body size: I compare the length, width, and height of the coil to the original part.
- Air gap clearance: I make sure the coil can be set correctly near the flywheel.
- Lead wire length: I confirm the ignition wire reaches the spark plug cap or kill switch connection comfortably.
- Connector type: I check whether the terminal and boot style match my existing setup.
How I Measure the Old Coil
My best method is to remove the old coil and measure it directly. I use a ruler or caliper for the body size and mounting points. I also inspect the coil for any part number stamped on it. If I can match the part number, that gives me extra confidence that the replacement will work.
What I Watch Out For
I have learned not to buy a coil based on appearance alone. Some aftermarket coils look similar but differ slightly in size or mounting pattern. I also avoid assuming that every FS55 replacement is identical, because model variations can exist. If I cannot confirm the measurements, I prefer to compare against the original part or ask the seller for exact specs.
Signs I Need a New Coil
I usually suspect the coil when I notice these problems:
- The trimmer has no spark.
- It starts and then dies unexpectedly.
- It runs rough at higher speed.
- I see visible cracking or damage on the coil body.
- The ignition wire or boot looks worn or brittle.
My Buying Tips
Before I buy, I always try to do the following:
- Compare the replacement coil with the original part number.
- Check the mounting dimensions and wire length.
- Read reviews from buyers who used it on the FS55.
- Choose sellers who clearly list measurements and compatibility.
- Confirm return options in case the fit is not right.
My Final Advice
In my experience, the best Stihl FS55 coil is the one that matches the original measurements as closely as possible. I do not rely on general compatibility claims alone. I measure carefully, verify the part details, and then buy with confidence. That approach has helped me avoid wrong parts and keep my trimmer running properly.
Final Thoughts
In my experience, getting accurate Stihl FS55 coil measurements is the key to diagnosing ignition problems quickly and avoiding unnecessary parts replacement. I always make sure to compare my readings with the manufacturer’s specifications so I can confirm whether the coil is truly faulty. My takeaway is that a careful measurement process saves time, money, and frustration while helping the trimmer run reliably again.
Author Profile
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I’m Miles Harlan, a Fort Collins-based writer who values the small things that make daily life easier. I have always been drawn to simple, dependable systems, whether that means a better way to manage a desk, pack for a trip, store everyday essentials, or keep a busy routine from becoming more complicated than it needs to be.
Years of administrative and community-facing work taught me to notice where ordinary tools fall short. I pay attention to confusing instructions, awkward setup, poor design, unnecessary apps, and products that promise convenience but create more work in the end.
Through PatrioticID, I share practical, first-person thoughts on everyday products. I write for people who want clear information, useful choices, and fewer purchases that end up forgotten in a drawer or closet.
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