Stihl FS40C String Trimmer First Use and Review


Of Mice and Mountain MenI 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.

So I popped down to the closest hardware store and bought a 1-gallon gas can, mixed in the Stihl oil, and filled the trimmer’s gas tank.

Firing Up My Stihl FS40C String Trimmer

The controls and start-up procedure are standard and familiar. This does have a convenient feature that opens the choke automatically if I gun the engine a little after start-up.

I pushed the primer bulb five times and the trimmer started up on the third pull. It would probably have started on the first or second had I primed it more. The first two presses on the bulb passed nothing but air — being brand new and never run.

5/27/2020 4:23:33 PM

At the moment the Stihl FS 40 C is the worse yard tool i've purchased new from local auto parts store. The so called auto feed when tapped down while running has never worked! I've wasted more time manually pulling the string out than the time it takes to do the job. I'm sorry I even bought it.

11/9/2017 4:40:08 PM

Allan, great review. I bought a Snapper a couple years ago in the year's end bargain section of Walmart. It's powerful trimmer with heavy duty wire core string. It will power through almost any overgrown weed or grass covered area. It's just what I wanted. The down side for most folks would be it is very heavy. I don't mind and really like the extra trimming power. I'm with you though. I don't trim for three hours at a time. The older I get the shorter the work periods get and the longer the rest periods get. It sounds like so far you are liking your purchase. Have a great trimming day. Nebraska Dave

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