FS-KM Line Head Trimmer

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This STIHL KombiSystem line head trimmer attachment is designed for trimming around obstacles.

Product Description

Turn your STIHL KombiMotor into an effective lawn trimmer with the FS-KM line head trimmer. This KombiSystem attachment uses the dependable AutoCut® head and delivers greater maneuverability around landscape obstacles.


1.2 kg (2.6 lbs.)*
*Without cutting tool, without deflector

Important Information

WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.


FS-KM Line Head Trimmer is rated 3.5 out of 5 by 63.
Rated 4 out of 5 by from FS-KM Line Head Trimmer Tough product. I wish it had an easier head to feed the trimmer line in it takes longer to feed than some of the other trimmer heads out there. But other than than it works well with no failures.
Date published: 2019-10-30
Rated 2 out of 5 by from This trimmer works well unless using it vertically then the line disappears and you have to open it up and thread the line out. This trimmer works well until you use it vertically, then the line disappears and you have to open it up and thread the line out.
Date published: 2019-09-07
Rated 1 out of 5 by from Junk - did an engineer ever use this? The strong winding system is crap. I think they drew it in CAD then sent it to China for production. Nobody ever used it in testing, because it takes about 5 min to realize it’s trash. The motor is fine, in fact it’s great. I have the sidewalk edger attachment and it’s great too. The string trimmer head is trash. The only real issue I have is how the string winds and how if it comes loose it tangled on itself and stops working. I just tried to trim the front yard and 10 min in I gave up, came inside and I’m looking for a replacement head because this one is trash.
Date published: 2019-08-24
Rated 5 out of 5 by from Works just like Stihl's FS series trimmers I have used Stihl 4 mix trimmers for years. Decided to buy the Kombi system to minimize the number of powerheads I have to maintain. I picked up a KM91R with this straight trimmer attachment and couldn't believe how solid it felt. At first I thought the unit would have some play at the coupler but it feels exactly as solid as the FS90 I've ran for years! As far as the comments go concerning trimmer string the head on this unit is the same head used on the FS series. I've always winded my string tightly and used quality trimmer string and have had 0 issues. The key is to trim at the outer edge of the swath path, keep plenty of line out, and keep from bumping hard objects with the head. Reloading the head is not difficult though it does require 2 seperate lengths of string. I wrap one length of line, cut it, and use the first length to measure the second length before wrapping the head. This method ensures that both strings rim out at the same time.
Date published: 2019-04-28
Rated 3 out of 5 by from This product is lacking The line trimmer head - specifically the line feed mechanism isn’t very good. I am continually having to take the line trimmer head apart to re-feed one side of the line in the trimmer head. This is at best an average design. I expected much better reliability. When the line is feeding correctly, which is about half the time, I would rate the performance excellent. But, the number of times the line feed malfunctions is unacceptable. My cheap Box store weed eater does not have this problem. It is simply underpowered for my needs. Please fix this and send out replacement heads on this product.
Date published: 2019-04-03
Rated 5 out of 5 by from Reliable product I've been working as a gardener for 6 years. I bought a KM90R and this FS-KM line head trimmer back in 2012. Since then, I've weed whacked countless acres over many hours with it, and it still works great. I usually have to replace the spool and cap every year, but I'm pretty hard on it, so it's ok with me. I don't experience issues with the string. I use a commercial grade, .27mm line with it, and I load it evenly. I just bought a KM-131R, so I'm excited for spring to come to do some weed whacking with it.
Date published: 2018-11-25
Rated 5 out of 5 by from I use the Km131 I use this product on a Apartment complex that has a ton aid sidewalks I sting this baby up and edge the whole place on half spool of line then I go to weedeating On the other half. All I use is stihl products keep your line out of the sun and learn how to use the Timmer before giving bad reviews. Keep up the good work guys
Date published: 2018-10-30
Rated 5 out of 5 by from love It I have been using my kombi for almost 10 years. I have the straight shaft trimmer, edger and cultivator. Heavier line goes through almost anything and very reliable starting. Those of you that have had problems should consult your dealer.
Date published: 2018-09-24
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