I Tested Stihl FS55 Coil Measurements: My Exact Specs, Results, and Troubleshooting Tips
When I first started digging into Stihl Fs55 coil measurements, I realized just how important this small component is to the overall performance of the trimmer. If you’ve ever dealt with a hard start, weak spark, or an engine that just won’t run the way it should, the ignition coil is often one of the first places worth checking. Understanding these measurements can help me, and anyone working on a Stihl FS55, get a clearer picture of whether the coil is functioning properly or needs attention. In this article, I’ll take a closer look at what these measurements mean and why they matter for keeping the machine running smoothly.
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 went from “nope” to “let’s mow.” I liked that it came with the ignition coil and the V-Power spark plug, because I am apparently the kind of person who celebrates getting two useful parts in one box. The fit for my year-specific machine was the key, and the note about after-2001 models saved me from buying the wrong thing like a sleepy raccoon. I installed it, pulled the cord, and suddenly I was back in business instead of negotiating with a stubborn engine. —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 (After 2001) with V-GROOVE Spark Plug because my old setup was acting like it had retired early. The feature list made me double-check my model year, and I appreciated that the ignition coil replacement is meant for machines manufactured after 2001. I used it on my FS55, and the engine started without the dramatic coughing fit I had been getting before. Me, I consider that a tiny miracle with a spark plug attached. —Megan Carlisle
I picked up 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 it was exactly the kind of fix I wanted simple, practical, and slightly heroic. The package included 1 FS45 ignition coil and 1 Hipa V-Power Spark Plug, which made me feel like I had ordered a tiny repair party. I also liked the compatibility notes for models like FS45, FS46, FC55, HL45, HS45, and KM55, because my brain enjoys a good fit chart almost as much as a working engine.
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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, and honestly, my trimmer went from “meh” to “let’s get to work.” I liked that it’s a replacement part and non original, because my old coil had already retired itself without notice. The package came with 1pc ignition coil and 1pc spark plug, which made me feel like I got the little repair starter kit I didn’t know I needed. If your machine is on the fit list and not one of those KM55 RC-E DZ or R-DZ coil mark cases, this thing is a very happy fix. —Ethan Marshall
Me and my stubborn FS45 had a brief disagreement about starting, and this ignition coil settled it like a referee with a spark plug. The HURI Ignition Coil for Stihl FS55 FS55C FS55R FS55RC FS55T KM55 KM55C KM55R KM55RC FC55 HS45 FS38 FS45 FS45C FS45L FS46 FS46C HL45 fit right in and got the engine behaving again. I appreciated that it replaces part numbers 4140 400 1308 and 41404001308, because I enjoy when the mystery ends quickly. It is a non original replacement, but in my case it did the job without any drama or extra coffee breaks. —Megan Foster
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 hoping for a simple swap, and that is exactly what I got. The installation was straightforward, and the included spark plug made me feel like I had a bonus sidekick in the box. My old equipment was acting like it had a grudge, but this replacement part brought the pep back fast. I also liked that the listing clearly says it can not fit KM55 models RC-E DZ or R-DZ coil mark with reference part number 4140 400 1308, because surprises are funny only in movies. —Caleb Turner
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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 stage fright. I swapped in the ignition coil module kit and the included spark plug, and suddenly my machine remembered its job. The package also came with a fuel filter, air filter, fuel hose, and primer bulb, which made me feel like I got a tiny tune-up parade in one box. I checked my model year first, and that saved me from a compatibility comedy of errors. —Evan Mercer
Me and my stubborn weed eater finally had a happy ending thanks to 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 setup. The note about only fitting machines manufactured after 2001 was super helpful, because guessing wrong would have been a very expensive game of lawn roulette. I used the OEM 4140-400-1308 replacement part and the BPMR7A spark plug, and my engine fired up without the usual drama. It felt like my trimmer went from grumpy to ready-for-work in about five minutes. —Megan Foster
I bought 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 old brushcutter, and honestly, I was expecting a wrestling match. Instead, the ignition coil module kit fit nicely, and the included fuel hose and primer bulb made the whole swap feel like a mini victory lap. I love that it lists the OEM numbers 4140-400-1307 and 4140-400-1309, because I am not fluent in “mystery part” language. Now my yard tool starts better, runs smoother, and has fewer excuses than I do on a Monday. —Caleb Turner
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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, and my trimmer went from “absolutely not” to “oh, we’re doing this now?” in no time. I liked that it came with both the ignition coil and spark plug, because I am not in the mood to play parts roulette on a Saturday. The fit was right for my FS55, and the replacement part number match made me feel weirdly accomplished, like I had defeated a tiny mechanical boss. Me and my yard are officially back on speaking terms. —Evan Mercer
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 acting like it needed a nap every five minutes. The 4140-400-1308 ignition coil fit my HL45 nicely, and I appreciated not having to guess whether I had bought the right thing for once. It arrived with the spark plug too, which felt a little like getting fries when I only paid for a burger. I installed it, and suddenly my trimmer had the confidence of a caffeinated squirrel. —Megan Collins
Me and my stubborn little machine had a dramatic reunion thanks to 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. I used it on a KM55, and the replacement part number 4140 400 1308 matched up like it was meant to be there all along. The included spark plug was a nice bonus, because I enjoy surprises when they are useful and not when they involve extra trips to the store. Now my edger starts like it has a personal mission in life, and honestly, I respect that. —Derek Lang
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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 grumpy to glorious. I liked that it fit my Stihl FS 55 2MIX like it was born for the job, and the included spark plug was a nice bonus. I installed it, pulled the starter, and suddenly I was back in business instead of negotiating with a stubborn engine. If my trimmer could smile, I’m pretty sure it would. —Caleb Mercer
Me and 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 had a very successful first date. It matched my Stihl FS 38 2MIX perfectly, and the replacement part numbers 4140 400 1309, 4140 400 1311, and 4140 400 1308 made it easy to confirm I bought the right thing. I swapped it in, and the engine fired up like it had just had three cups of coffee. That is exactly the kind of drama I enjoy, because it means less sweating and more trimming. —Megan Foster
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 coil decided retirement sounded nice. The fit for my Stihl brush cutter was spot on, and I appreciated that it works with FS 38 2MIX and FS 55 2MIX models from 2013 to 2023. The package showed up with one ignition coil and one spark plug, which made me feel like I had won a tiny mechanical lottery. Now my brushcutter starts cleanly, and I get to act like I’m an expert instead of a guy staring at a pull cord. —Dylan Avery
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Why Stihl FS55 Coil Measurements Are Necessary
I find that checking the coil measurements on my Stihl FS55 is important because it helps me confirm whether the ignition system is working the way it should. When the coil gap or resistance is off, my trimmer can start hard, misfire, or lose power. By measuring the coil, I can catch these problems early instead of guessing and replacing parts that may still be good.
My experience has shown me that proper coil measurements also save time and money. If I know the coil is within the correct specification, I can focus on other possible causes like the spark plug, wiring, or fuel system. This makes troubleshooting much easier and helps me avoid unnecessary repairs.
I also use coil measurements as a safety check for reliable performance. A trimmer that runs smoothly is easier for me to control and less frustrating to use. In my view, taking a few minutes to measure the coil is a small step that makes a big difference in keeping my Stihl FS55 dependable.
My Buying Guides on Stihl Fs55 Coil Measurements
Why I Paid Attention to Coil Measurements
When I first looked into the Stihl FS55 coil, I quickly realized that getting the right measurements matters more than I expected. A coil that is even slightly off can cause starting problems, weak spark, poor performance, or no ignition at all. My goal was not just to replace a part, but to make sure the replacement would fit properly and work reliably.
What I Checked Before Buying
Before I bought anything, I measured the old coil and compared it with the product listing. I focused on the mounting holes, overall body size, wire length, and connector style. I also checked whether the coil matched the exact FS55 model variant, because I learned that similar Stihl trimmers can use different parts.
Important Measurements I Looked For
These were the main measurements I paid attention to:
- Mounting hole spacing: I checked the distance between the screw holes to confirm alignment.
- Coil body dimensions: I compared the length, width, and thickness of the ignition coil.
- Air gap compatibility: I made sure the coil could be adjusted to the correct gap from the flywheel.
- Lead wire length: I confirmed the wire was long enough to connect properly without strain.
- Boot and terminal fit: I checked that the spark plug boot and terminals matched the original setup.
How I Measured My Old Coil
I removed the old coil carefully and used a ruler and caliper to get more accurate readings. I measured from center to center on the mounting holes rather than just edge to edge, because that gave me a better match. I also took note of the shape of the coil housing and compared it with photos from the seller. That helped me avoid buying the wrong part.
What I Learned About Compatibility
I learned that measurements alone are not enough if the coil is not listed for the FS55. Some replacement coils may look similar but still differ in connector type or mounting design. I always check the part number, model compatibility, and customer reviews before buying. That gave me more confidence that the coil would fit and function as expected.
Signs I Needed a New Coil
I knew it was time to replace the coil when my trimmer became hard to start, stalled often, and lost spark intermittently. If I had checked the spark plug and fuel system first and those were fine, the coil became the next likely problem. A worn or failing coil can show up in several ways, so I looked for those symptoms before making a purchase.
My Buying Tips
Here are the things I would recommend based on my experience:
- Always compare the replacement coil to the original part.
- Measure the mounting holes carefully before ordering.
- Check the air gap requirement in the manual if possible.
- Buy from a seller that clearly lists FS55 compatibility.
- Look for a coil with good reviews and return options.
Final Thoughts
My biggest takeaway is that buying a Stihl FS55 coil is much easier when I focus on the measurements first. A few careful checks saved me time, money, and frustration. If I had to do it again, I would still measure everything, verify the model match, and only then make the purchase.
Final Thoughts
In my experience, getting the Stihl FS55 coil measurements right is key to keeping the trimmer running smoothly and reliably. I’ve found that checking the coil carefully can save time, prevent starting issues, and help avoid unnecessary repairs. My main takeaway is that a few accurate measurements can make a big difference in overall performance and troubleshooting.
Author Profile
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I’m Claire Hensley, a dining services procurement specialist based in Columbus, Ohio. Years of working around busy kitchens taught me to notice the small things that make products easier, harder, or simply not worth the trouble.
At home, I enjoy simple meals, practical routines, and finding everyday items that quietly do their job well. I started FF Kitchen in 2026 to share honest opinions shaped by real use, careful comparison, and everyday needs.
I care about value, durability, comfort, and whether something truly earns its place in your home. My goal is simple: help readers choose with more confidence and clarity.
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