Stihl FS 45 Weed Eater Review: Specs, Features, How To Use, Price, Alternatives

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I recently picked up the Stihl FS 45 Weed Eater for trimming the grass around our gardens.

I had been using sprays until about a year ago but came to understand the damage they do so have completely stopped using them. Instead, I’ve got my weed eater.

The FS 45 does seem to be a very good line trimmer (see how chuffed I am about it in the pic above)!

It’s nowhere near as powerful as the Stihl FS 55 (or the later FS 56 RC-E) which I’ve previously used, but it has its place for lighter work around the home, for sure!

Check current prices on Northern Tool or Acme Tools.

Stihl FS 45 Weed Eater

weed eater stihl fs 45

I’ve been using the FS 45 for a couple of months now and feel like I can write somewhat intelligently about it.

I’ve mostly been using it for:

  • Short grass around the garden and vegetable beds
  • Longer grass in the paddocks
  • Weeds and very light brush
stihl fs45 weed eater
The FS 45 in action

The FS 45 Gas Line Trimmer is not designed for longer, thicker grass, but I have tested it out on that sort of thing and it does get through it. However, she’s a bit slow at that type of stuff.

It’s really good, fast, and effective at light trimming around the house but struggles a bit on the thicker grasses. It has a good bit more power than the FS 38, but it’s definitely not a brush cutter.

Stihl FS 45 Unboxing

stihl fs 45 unboxing
A new Stihl FS 45

My Stihl FS45 was good to go out of the box.

The instructions show how to assemble the head and set up the line, but mine was completely set up. The handle was attached and I only had to click on the deflector and mowing head.

Check out this unboxing and set-up video from Stihl for complete instructions.

I did have one problem with my trimmer out of the box – it would only idle, but as soon as I revved the engine, it would die on me.

I didn’t want to mess around with it too much as it was brand new, so I took it down to my local Stihl Shop.

That was a bit of a pain because it’s half an hour away (I ordered online and had it delivered), but I did enjoy looking at all the Stihl chainsaws out the back, including a bunch of their most powerful models.

The guy at the shop was really good and spent about 20 minutes to half an hour playing with the carb and getting it right. I believe he also trimmed the fuel line. He said the new engines just need a bit of tweaking when new as there was probably not enough fuel getting through (or, perhaps, too much – I forget).

Anyway, he got it going well (as it should be) and said to bring it back after I’ve put 5 tanks through it for another tune-up.

stihl fs45 price
The oil and extra line were bought separately

What does the FS 45 come with?

Everything you can see in the image above, minus the Stihl HP Ultra Oil and extra line. I ordered the HP Ultra Oil because doing so extends the warranty out another year – and because it’s good!

The head came with a bit of complementary line to get started, but it wasn’t a whole lot.

The exact contents of your Stihl FS 45 order may vary depending on the country or state you’re in. Stihl Shops will also run different promotions from place to place.

If you buy trimmer line in bulk, this is how to stop it from becoming brittle and breaking.

Specs And Features

stihl weed eater fs45
The FS 45 is very light

Another benefit of the FS 45 is its weight – only 9 lbs or 4.5 kgs.

This means you can use it for a couple of hours without becoming too tired and sore. There isn’t a model that comes with the bike-style handle, it only comes in the loop handle.

There is also a Stihl FS 45 C-E version – the difference between this and the base model is that it has the ErgoStart feature making it easier to start. However, my non-C-E Stihl FS 45 starts so easily that it’s hard to imagine that it could be any easier!

Other Stihl FS 45 specifications:

  • 2-stroke gas engine
  • 0.75 kW power
  • 27.2 cc
  • 1.66 cu. in.
  • 1.34 in bore
  • 1.18 in stroke
  • 2800 RPM idle speed
  • 9500 RPM max speed
  • NGK BPMR 7 A spark plug
  • 9 lbs/4.5 kgs

The standard line for the FS 45 is the Stihl Green Nylon Line 2 mm. Download the Stihl FS 45 manual here.

One of the main questions that gets asked about the FS 45 is ‘Does the line come out automatically?’

The answer is yes and no!

No, not completely automatically, you need to bump it the head against the ground while it’s going. It’s called the Stihl Bump Feed Head or Bump Feeder Head.

You don’t need to manually pull the line out or anything like that, you just give the head a bump on the ground when the line gets short. Ideally, you want to keep the line within an inch or so of the line-limiting blade on the deflector.

If you let the line get too short, you can lose the end of the line in the head – then you have to stop the unit and manually get the line out again.

Other Stihl FS 45 features:

  • Primer bulb
  • Easy controls
  • Loop handle
  • Easy-feed mower head

It’s a basic line-trimmer, more in the entry-level zone, so it has everything you’d expect on a reasonably cheap model. While it’s not a pro-weed-eater or brush cutter, my opinion is that it is still better than some of the other cheaper line trimmer brands.

It has a flex shaft rather than a solid shaft, which means it can have a curved end rather than a straight shaft, but it also means it’s not as durable or able to tackle tough jobs.

Stihl FS 45 Review

I’ll put together a video review of the FS 45 in the coming weeks, but overall I’m happy with it.

I will also get a more powerful model for the tougher jobs I need to do around the property, but the FS 45 is great for the work around the yard.

The price was good during a sale, and it gets the job done, so that’s all that matters. There was a slight hiccup with it not working straight away and needing somewhat extensive tuning, but that’s what you get with gas engines.

All in all, the FS 45 is a good weed eater and I can recommend it.


  • Lightweight
  • Starts quickly and easily
  • Doesn’t chew through gas
  • Effective trimmer
  • Looks great


  • May need some tuning before use
  • Not for long grass

Stihl FS 45 Trimmer

The FS 45 may no longer be for sale in the USA/Canada, but is available in Australia, New Zealand, and other locations around the world.

If you have heavy work to get done, I’d get a more powerful line trimmer because the FS 45 isn’t ‘the ultimate trimmer.’

However, if you just need one for trimming around the home, I think it’s worth grabbing. It’s pretty cheap, it goes well, and it’s worth it.

Please let me know if you have any questions in the comment section below.

Now, you must all be wondering, what does the FS mean on Stihl Line Trimmers?


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3 thoughts on “Stihl FS 45 Weed Eater Review: Specs, Features, How To Use, Price, Alternatives”

  1. I have a model 55 but it doesn’t come w the crank assist so I figure it is an older version and I have a Husqvarna commercial grade as well as a echo-commercial grade and then a old 38 model and my model 55 is a tough, light, easy to operate piece of equipment that is really hard to find the exact value of ; it versus the newer model 45 wich I do think I have an accurate estimate of it used with approximately 3 seasons of use under its proverbial belt so I’ll say they both have around the same run time with them both being of sound moter and frame/ ima goi g to price the m45 at 125$ & the m55 at 150$ so with that being carved in stone I ask for the expertise of my fellow followers to not only corrected if I’m wrong but to also counter my price w a alternative price that’s fair and mabey even a little under so I will b Abel to sale these jewls and in turn purchase me one or possibly even two others to plywith and hopefully write another review on so if I did get lucky like I think I have then we can test my ability to put my words where my mouth is on a cpl of the same or even 1 or 2 completely different makes and models of weedeaters . I’m going to branch out into the chainsaw arena soon cause that is truly wer I’m most comfortable and wer I have the most time spent putting equipment thru some of the roughest & toughest work outs that your everyday makes just won’t last long enough to give that accurate shake…hope that u are looking forward to my next time on board the push it till it does or it doesn’t break and then push it some more train….either way I think I ll have fun doing it and if I’m not catapulted into stardom by my highly accurate yet hardly understandable reviews…! Thanks alot from the one and only(if u know me u hope) CHAD TIMOTHY LEFTWICH


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