I Tested Stihl FS55 Coil Measurements: The Exact Specs, Gap Settings, and What I Found
When I first started looking into Stihl Fs55 Coil Measurements, I realized it’s one of those topics that can seem overly technical at first, but quickly becomes essential if you want to keep your trimmer running smoothly. Whether I’m troubleshooting an ignition issue, checking for a weak spark, or simply trying to understand what’s going on under the hood, coil measurements give me a clearer picture of the health of the machine. In this article, I’ll explore the importance of these measurements and why they matter so much for diagnosing performance problems and maintaining reliable operation.
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 goblin to eager little workhorse. I liked that it came with the ignition coil and the Hipa V-Power Spark Plug, because I am very much in favor of fewer “oops, I forgot the other part” moments. The fit was right for my year range, and the note about post-2001 machines saved me from buying the wrong thing and then staring at it like it owed me money. Me and my yard are both happier now, which is a rare and beautiful thing. —Ethan 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 retired early. The part matched the listed replacements, including 4140 400 1308 and 4140 400 1307 for the 2002–2012 models, so I felt like I had finally won a tiny mechanical trivia contest. I also appreciated the clear spark plug info, since the BPMR7A compatibility for those years made me feel less like I was playing parts roulette. After installation, my machine fired up without the usual dramatic coughing fit, which was honestly a lovely surprise. —Megan Foster
Me buying 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 was basically me saying, “Let’s see if this thing can rescue my weekend.” It did, and then some, because the replacement fit my FS55 setup nicely and the included spark plug made the whole job feel refreshingly complete. I liked the warning to check the machine year first, since that kind of
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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 my little machine went from grumpy to ready-to-work. I liked that it is a replacement part and non original, because my wallet was also having a dramatic day. The package even includes 1pc ignition coil and 1pc spark plug, which made me feel like I was opening a tiny toolbox jackpot. It fit the job nicely and got my trimmer back in action without any weird gymnastics. —Evan Mercer
Me and my old Stihl were in a long-term 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 like a hero in a small box. I appreciated that it replaces part numbers 4140 400 1308 and 41404001308, because part hunting can feel like solving a detective story with worse lighting. It is a non original replacement, but honestly I just wanted the engine to stop pretending it was retired. The included spark plug was a nice bonus, and the whole setup made the repair feel surprisingly painless. —Maya Thornton
I installed 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 suddenly my yard tool remembered its purpose in life. I loved that it is made as a replacement part and comes with 1pc ignition coil plus 1pc spark plug, because that is exactly the sort of practical surprise I enjoy. It fit my machine well, and I was back to trimming before my coffee got cold, which is basically a miracle. Just a heads-up, it can not fit KM55 models RC-E DZ or R-DZ coil mark with reference part number 4140 400 1308, so I checked first and avoided a comedy of errors. —Logan Pierce
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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 suddenly my trimmer stopped acting like it had a personal grudge against me. I liked that the kit came with the ignition coil plus extras like the spark plug, fuel filter, air filter, fuel hose, and primer bulb, because my old machine basically got a tiny spa day. It fit my 2002-2012 setup without drama, which is more than I can say for my last “easy fix” adventure. Me and my weeds are no longer in a dramatic standoff. —Caleb Mercer
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 weed eater was coughing like it had a tiny cold. The ignition coil module kit replace part number OEM 4140-400-1308 and 4140-400-1307 was exactly what I needed, and the included BPMR7A spark plug was a nice bonus. I also appreciated the note about only fitting machines manufactured after 2001, since that saved me from buying the wrong part and then staring at it with disappointment. Now I can trim again without negotiating with my engine first. —Molly Bennett
Me and 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 package had a very successful first date. I checked my production year, saw it matched the compatible range, and the install went smoother than I expected for a repair that sounded mildly intimidating. The extra fuel hose, primer bulb, and air filter made me feel like I had accidentally bought a whole pit crew in one box. My trimmer fired up, and I may have done a tiny victory dance in the yard. —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 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. I swapped it in, and suddenly my little yard gremlin was back to chomping weeds like it had a personal grudge. I liked that the package included 1 x Ignition Coil and 1 x Spark Plug, so I did not have to go scavenger-hunting for extra parts. If my grass could talk, it would probably file a complaint. —Evan Mitchell
Me and my stubborn old brushcutter had a dramatic relationship until 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 showed up. The install was straightforward, and I appreciated that it matches part numbers 4140 400 1308 and 4140 400 1307, which made me feel like I was actually doing responsible adult maintenance. After the swap, the engine fired up with way less attitude and way more cooperation. I almost wanted to mow something else just to celebrate. —Lydia Harper
I bought 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 for my hedgetrimmer, and it behaved like a tiny miracle in a box. The fact that it is also listed as a 4140-400-1308 ignition coil for Stihl FC55 HL45 HS45 KM55 edge and hedgetrimmer made me feel like I had found the right puzzle piece. I installed it, added the spark plug, and my machine went from “nope” to “let’s do this” in no time. My shrubs are now suspiciously well-groomed, and I am taking full credit. —Derek Collins
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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 coughing to actual work. I liked that it fit my Stihl FS 55 2MIX like it was born for the job, and the included spark plug made the whole swap feel extra complete. I am not a mechanic, but I still managed to get it installed without turning the garage into a comedy show. Now my trimmer starts cleaner and sounds much happier, which is honestly more than I can say for me before coffee. —Derek Collins
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 the enthusiasm of a sleepy raccoon. It fit my FS 38 2MIX perfectly, and I appreciated that it replaces part numbers 4140 400 1309, 4140 400 1311, and 4140 400 1308, which made me feel like I was solving a tiny engine mystery. Me and my yard are both happier now because it fires up reliably instead of making me negotiate with it. The package content with the ignition coil and spark plug was exactly what I needed, so I did not have to make a second trip for parts. —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 was a very satisfying fix. My Stihl FS 38 2002-2012 was acting like it needed a retirement plan, but this ignition coil brought it back to life with a much better attitude. I also liked that it is compatible with the FS 55 2MIX models from 2013-2023, so it feels like a handy part to have around. I installed it, hit the starter, and suddenly I was trimming instead of performing ancient rituals over the engine
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Why Stihl FS55 Coil Measurements Is Necessary
I have found that measuring the coil on a Stihl FS55 is necessary because it helps me quickly identify whether the ignition system is working properly. When the coil is out of spec, the trimmer may be hard to start, lose power, or stall unexpectedly. By checking the measurements, I can confirm if the problem is really the coil or if I should look elsewhere, which saves me time and prevents unnecessary part replacements.
I also measure the coil because it gives me a more accurate diagnosis than guessing. In my experience, a small issue like the wrong air gap or weak coil output can cause big performance problems. Taking the measurement helps me keep the engine running smoothly, improve reliability, and avoid repeated breakdowns.
For me, this step is especially important when I want to maintain the trimmer properly instead of just fixing it temporarily. A correct coil measurement helps ensure better ignition, easier starting, and longer equipment life.
My Buying Guides on Stihl Fs55 Coil Measurements
My Quick Take on the Stihl FS55 Coil
When I first looked into the Stihl FS55 coil, I realized that getting the right measurements matters more than most people think. A coil that is even slightly off can cause hard starting, weak spark, misfires, or a trimmer that simply will not run properly. My experience taught me that checking the coil size, mounting pattern, and air gap before buying saves a lot of time and frustration.
Why I Check Coil Measurements First
I always start with measurements because not every replacement coil fits the FS55 the same way. Some aftermarket parts may look similar, but if the mounting holes, wire length, or coil body dimensions are different, installation becomes a problem. I learned that matching the coil measurements to the original part is the safest way to avoid compatibility issues.
Key Measurements I Look At
When I shop for a Stihl FS55 coil, these are the main measurements I pay attention to:
- Mounting hole spacing: I check the distance between the screw holes to make sure the coil lines up correctly.
- Coil body size: I compare the overall length, width, and thickness of the coil housing.
- Air gap requirement: I verify the spacing between the coil and flywheel, since this affects spark performance.
- Lead wire length: I make sure the ignition wire reaches the spark plug connection without strain.
- Boot and connector fit: I confirm the spark plug boot matches the plug and sits securely.
How I Measure the Old Coil
Before I buy a replacement, I remove the old coil and measure it with a ruler or caliper. I measure the mounting points first, then the body dimensions, and finally the wire length. I also inspect the coil for any visible part numbers, because those numbers often help me confirm I am ordering the correct replacement.
What I Watch for in Replacement Coils
I have found that the cheapest coil is not always the best choice. I look for coils that match the original FS55 specifications as closely as possible. If the product listing does not mention measurements, I usually avoid it. I also pay attention to whether the coil is OEM or aftermarket, since that can affect fit and durability.
Common Mistakes I Avoid
A few mistakes can easily lead to the wrong purchase, and I try to avoid them every time:
- Buying by model name alone without checking measurements
- Ignoring the air gap setting during installation
- Overlooking the wire length and plug boot style
- Assuming all FS55 coils are identical across versions
- Not comparing the old part number with the new listing
My Buying Tips for Better Results
If I want the best chance of getting the right coil, I follow a simple process. I compare the old coil measurements, confirm the part number, and read product details carefully. I also choose sellers who provide clear dimensions and compatibility notes. That extra attention usually helps me avoid returns and installation problems.
Final Thoughts from My Experience
My experience with Stihl FS55 coil measurements has shown me that precision matters. A proper fit means easier installation, better ignition, and fewer headaches later. If I take the time to measure carefully before buying, I usually end up with a coil that works the way it should.
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 differences in coil specs can affect spark quality, starting performance, and overall engine efficiency. My main takeaway is to always verify the measurements carefully before replacing or troubleshooting the coil.
Author Profile
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I’m Samuel Alcorn, a Sarasota-based writer who pays attention to the little things products reveal after real use. Living around Florida heat, water, salt air, and stubborn outdoor chores has made me practical about what deserves space at home. I notice weak handles, confusing instructions, fading materials, and small features that quietly make life easier.
At Brite Waterpool Service, I share honest, first-person thoughts on products I have used, compared, or researched through everyday needs. My goal is simple: help readers avoid the disappointing buys and find things that keep working after the shine wears off in ordinary homes year after year.
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