2/1/2022

Fs 40 Stihl

If you find yourself leaning towards a green option that leaves only a small footprint. The FS 45 versus the FS 40 C-E is a lightweight but capable trimmer positioned as a step-up from the low end of Stihl's trimmer product line. The FS 40 is a more fully featured trimmer, with power.

Direct product selection:Petrol brushcutters for trimming grass

Modern, convenient and very easy to start. Ideal for around-the-garden trimming tasks.

General

With simplified starting system, for mowing smaller areas of grass. Multifunction handle, round handle, 2-MIX engine.

Versions

Stihl fs 40 c e trimmer


Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.

Technical specifications

Technical specifications

Technical specificationsValue
Displacement 27,2 cm³
Power output 0,7/1kW/bhp
Weight 1) 4,4 kg
Sound pressure level with plastic tool 2) 94 dB(A)
Sound power level 2) 107 dB(A)
Vibration level, left/right with plastic tool 3) 7/6,4 m/s²
Total length 4) 145 cm
Cutting tool AutoCut mowing head C 5-2

1) Weight excluding fuel, cutting tool and guard
2) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
3) K-factor according to DIR 2006/42/EC = 2m / s ²
4) Without cutting tool

Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.

Features

Standard equipment

  • STIHL 2-MIX-Engine

    2-stroke engine with stratified charge. A fuel-free layer of air is created between the burned charge in the combustion chamber and the fresh charge in the crankcase, reducing the amount of fuel lost during the charge cycle. This results in more power with a lower weight, up to 20% lower fuel consumption than regular 2-stroke engines and significantly reduced exhaust emissions.

  • Multi-function control handle

    Easy, comfortable thumb-operated control means the operator's hand never leaves the handle.

  • Simplified starting system

    Simply set the choke, pump the fuel primer, pull the starter cord and away you go! The running machine then switches off after a brief press of the stop button. Once the machine is at a standstill, the ignition activates again automatically. Thus the ignition is always ready for starting.

  • Manual fuel pump (Purger)

    A small fuel pump delivers fuel to the carburettor at the touch of a button. This reduces the number of starting strokes required following extended breaks in operations.

  • Goggles

    It is important to protect your eyes from flying particles and harmful UV radiation. Therefore a pair of safety goggles/glasses are supplied with the the machine. Note: Additional face protection must be worn when working with brushcutters.

Retrofitted equipment

  • STIHL ErgoStart (E)

    STIHL ErgoStart cuts the effort required to start the tool by half, while the starter cord can be pulled at just one third of the normal force. A coil spring between the starter cord and the crankshaft smoothes out force peaks, making them virtually undetectable through the cord itself.

  • Shoulder strap / carrying system

    Using a STIHL shoulder strap or carrying harness with soft padding makes work more comfortable, particularly during lengthy jobs.

Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.

Cutting Tools

Cutting Tools

    • DuroCut mowing head 5-2

      Double lines, for mowing and thinning work. Up to four lines can be easily inserted. Compatible with many different sizes and types of mowing line.

    • DuroCut mowing head 5-2

      Double lines, for mowing and thinning work. Up to four lines can be easily inserted. Compatible with many different sizes and types of mowing line.

    • AutoCut C mowing head (2-line)

      Double lines, for mowing and thinning work. Mowing lines are automatically extended when the mowing head is tapped on the ground. With comfort grip for easy re-loading.

    Versions

    • Mowing head AutoCut C 5-2
    • AutoCut mowing head C 6-2

      Double lines, for mowing and thinning work. Mowing lines are automatically extended when the mowing head is tapped on the ground.

    Versions

    • AutoCut mowing head C 6-2

Fs 40 Stihl Trimmer

Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.

Accessories

Accessories

    • STIHL Smart Connector

      The Smart Connector can be attached to petrol-driven, electric, and cordless products, enabling it to deliver important information about your STIHL power tool via Bluetooth® 4.2. The Smart Connector offers entirely new functions and services, as a basis for device management both in your home garden using the STIHL app, and for managing your machine fleet using the STIHL connected Portal.

    Technical specificationsValue
    Weight 20 g
    Dimensions (l x b x h) 53 x 42 x 14 mm
    Signal range ca. 10 m
    Running time per battery charge ca. 1 Year
    Connectivity BLE 4,2
    Battery 3V CR2.032
    • Plastic blades for PolyCut 6-3, 7-3, 20-3, 41-3

      For PolyCut, twelve plastic blades.

    • Protective cover for brushcutters

      Perfect transport protection for the engine housing of brushcutters and clearing saws. For FS 38 - FS 450.

    Versions

    • Protective cover for brushcutters
    • Line pieces for DuroCut mowing head

      Replacement line pieces for DuroCut mowing head.

    Versions

    • For DuroCut 5-2 and 20-2, L

Deviations from the product range and information provided here are possible, depending on the country. STIHL reserves the right to make changes to technical specifications and equipment.

Documents

Owners manuals and safety brochures

LanguagesDateLink
de / fr / it / nl 24.08.2020
By Allan Douglas Aug 23, 2017

I recently wrote about my adventure in trimmer shopping, this is the follow-up to that piece as a review of my new Stihl FS40C string trimmer.

Stumbling Start

Testing was delayed by the fact that I didn’t have a 1-gallon gas can. I have several 2-gallon cans, and one is a can into which I pump precisely 2 gallons of gas for use in my 2-stroke equipment. I have some gas/oil mixed up but that’s a 40:1 mix for my older tools. The Stihl FS40C string trimmer uses a 50:1 mix.

I bought a six-pack of synthetic oil for the Stihl, each bottle mixes with one gallon of gasoline. I figured I’d use that can of new gas and two bottles of oil and be all set to fire up and see what it can do. But the manual and some commentary online talk about the need to use the gas/synthetic oil mix within 30 days or it begins to decompose, and using degraded gas/oil can void the extended warranty (four years) Stihl offers. In fact, in reading the warranty there are several ways they try to get out of paying for repairs during that second two-year period.

Firing Up My Stihl FS40C String Trimmer

As you can see, I could set this one down and leave it for a long time and it continues to purr right along.

Gas Mileage

Fs 40 Stihl

One of the few complaints I saw in reviews on the Stihl FS40C string trimmer was that it has a small fuel tank and requires frequent fill-ups. But I found this not to be the case. Maybe it was an old review and the issue has been addressed since, or maybe the reviewer expects to trim for three hours solid. I trimmed my workshop yard (small but steep) and the dog’s play yard (1/3 acre) and still had some fuel left in the tank. That’s plenty of “mileage” for me in one session.

Power and Performance

Fs 40 Stihl

At 27cc this engine is a bit smaller than the 31cc in my Poulon, but the Stihl FS40C string trimmer had no trouble powering through grass and standing weeds. The .80 line it uses punched through the small brushy stuff better than the .65 line on my Poulon. The bump feed on the line is not as touchy as the old one had gotten to be, either. I tended to use up line faster than I should because accidental bumps against the ground would feed line that just got cut off by the blade. Not a problem with the new Stihl.

As I was working, I did notice that the engine went “flat” a few times. Each time I told myself, “OK, here we are running out of gas already,” but then it picked up power and kept going. I’m not sure what that was about.

The throttle is responsive, the engine not too loud, and the unit is lighter in weight than my old one. This is largely because of the shaft design I chose.

Stihl Fs 40 Trimmer Head

Which Shaft?

You have three choices to make in trimmer shafts:

  • straight shaft or curved
  • long shaft or short
  • split shaft or solid

Curved or Straight?

Straight shafts use a mechanical gearbox on the end of the shaft to change the direction of power and channel it into the cutter head. Curved shafts use a flexible cable inside a housing to transmit power to the cutting head.

A straight shaft offers a lower cutting head, thereby being better at getting underneath fence rails, sheds, shrubbery, and so forth. The gear box makes the end of the shaft heavier, but is said to be more efficient in transmitting power to the cutting head. Just make sure you check the oil in the gear box occasionally.

Stihl

The curved shaft eliminates that cast metal housing and gears, thereby making the shaft lighter. The trade-off is that the cable running through a curved shaft can create friction, and some folks complain about frequent failure of these cables. Mostly in low-end brands, though. I’d expect Stihl to use a properly sealed and lubricated cable and housing. I saw no complaints about this in product reviews by other buyers.

Long or Short?

Both styles come in a long-shaft and a short-shaft version. If you need a long reach (like reaching over a brow to cut a steep embankment) a long shaft is handy. For tight quarters the short shaft is great.

Split or Solid?

Both styles also offer a split-shaft version that allows you to change out the implement on the end of the shaft. String trimmer, brush cutter, pole saw, leaf blower, edger, and cultivator are some of the attachments available for some of these systems.

I had the cultivator (tiller) and the brush cutter blade for my Poulon, but rarely used them. I decided to forgo the split-shaft this time around. I also bought a curved shaft for the first time, and a short shaft at that.

Putting It To Work

I noticed the difference right off. Not having the long shaft with gear box cantilevered out on the end of it made the trimmer much easier to handle. It felt weird having the cutter so close to my feet, though. I will definitely miss that long shaft when weed-whacking up in Copperhead County. That extra few feet of exploratory distance was comforting.

Fs 40 Stihl Trimmer Carb

But working around my walkways and lumber piles was much easier because I wasn’t doing so much jockeying to move through the tight spaces and get into the corners.

In order to get the cutter head parallel to the ground, I still had to hike the engine up my side, but that’s because I’m short. The short shaft did help a bit as the hot engine did not have to be tucked up into my armpit.

Stihl FS40C String Trimmer Conclusion

I’ve used this string trimmer several times now and have found it to start right up, run strong (those momentary power drops have not repeated), and have plenty of power and work time. The lighter weight makes trimming less of a chore, too. I’m happy.

More Info: Listing on Stihl web site

Stihl

Fs 40 Stihl Trimmer Parts

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