This channel has a whole mess of videos about that and related topics. It's a fun diversion.
Since were talking about string trimmers, I have a commercial Stihl FS250R 2-cycle brushcutter, that I switched out the stock cutting head on it, and put a far nicer Echo 450 speed feed head on it.
I don't really use it anymore, because I am not doing brush clearing work anymore, nor am I having to go up against 3-feet of field length grass, around homes anymore. Its got 40.2cc's of power, its a beast of a machine, and its got the weight to prove it, shoulder strap required.
I also have a commercial Honda 4-cycle 35cc string trimmer. Its less powerful then my Stihl brushcutter, but 35cc's is still a solid amount of power, and it can handle up to 1-foot of tall thick grass at a time going full throttle.
I never installed the stock head on it, cause the plan was to install the Echo 450 speed feed head on it, since I loved it so much on my Stihl, and its a solid performer. A good all rounder machine, that can handle light brush, mostly grass. But the weight does also require a shoulder strap!
The great thing about 4-cycle, is you don't have to mix the oil with the gas, and the engine is far quieter by design. It has overhead valves as one would expect, and Honda's classic design, overhead cam as well, with a mini timing belt inside. You can see it if you remove the valve cover too!
So aside from no mixing oil/gas, engine being quieter, you also get that low end torque, which means I don't need to use full throttle all the time. The engine has an oil pump that allows the engine to work at any orientation, so you don't blow the engine. But its still air cooled however too.
The main issue with 4-cycle is the weight. It weighs only 1-pounds lighter then my Stihl, but still too much weight without a shoulder strap. I really like my Honda string trimmer, but I am getting older, and I am getting tired of having to put on my harness just to use it.
My latest string trimmer purchase, I actually made last year. I got a commercial 40v Makita string trimmer, that runs on 4.0 lithium phosphate packs. It is a beauty of a machine, and it weighs so little, I don't need a shoulder strap or harness!
Now, keep in mind, Makita makes 2-different versions of their machines, one with the motor in the back, and one with the motor at the cutting head. I chose the one with the motor at the cutting head, as I proffered the added weight being on the head where it belongs, not at the back, putting the load on me.
Now, we are going down more cc's, by using Makita, its a 25cc machine. So the power it produces, is closer to a consumer 25cc gas powered machine. If I have to do a serious job, I will use my Honda string trimmer.
Believe it or not though, this battery operated string trimmer, manages 8-inches of tall grass with ease. As long as I don't push it to its limits, by pushing it too hard, it won't throw the safety kick off. Like any job done well, you give the machine time to eat its food, you don't force it!
I bought a model that has a variable speed trigger, like a gas machine, as that is what I grew up on and understand, so thats what I got. The cool thing is, it also has speed torque modes you can lock in. So for example, if I want to weed eat around flower beds, that have some grass growing between plants, I can lock in the speed mode to level 1.
This means, even if I pull the trigger to full throttle, it won't go above the setting chosen, and keep the torque and speed light, so I don't make mistakes in the flower beds, and cut off someone lily plant. Cause that would be bad!
So other then the variable speed trigger, 3 different speed modes to lock in, it also has an auto sensing mode, which is the mode I use most of the time. This is what allows me to preserve battery life.
In auto sensing mode, I can pull the trigger to full throttle all I want, but it will only go the speed setting of 1, while the load is light enough. Then if it senses a greater load, it speeds up to setting number 2, which provides more speed and power.
If I am really loading the string trimmer up on a tough job, it will then upgrade me to setting number 3, full speed, full torque power. You'd be amazed just how much power this 40v battery operated tool has. If you watched video's of this machine online, when its going full power, full speed, you'd swear its got the power of gas!
The machine is so light, I don't even need a strap, its a dream to use, I absolutely love it. But yes, its still a battery tool, so yes, make sure you have at least 2-batteries or more, depending on the size of your lot.
Oh, I forgot to say, yes I put a speed feed on this one too lol. But this ones the smaller 400 head, for lighter powered machines. Holds a little less line in it, but still holds enough. A dream of a machine IMO.
Y'all is something I noticed whilst watching US tv.
Proper secateurs cant fix that.
I know something that will though. 
A GT can stand for Gran Turismo, too. You can find that on Cars.
As Dick Dastardly would say, drat, drat, and triple-drat, I forgot about box hedging and secateurs! Sacre bleu even!
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Yep, seems legit. Would I do that? Nope! I have a Milwaukee 24" hedge trimmer, cause you know, as my dad taught me, always use the proper tool for the job.
But hey, this will make you laugh. Also, notice the janky bag covering the engine? Is that his way of keeping the throttle up? All it takes is for him to slip once, and you know how the rest goes.
Also, I gotta say, my hedge trimmer is gonna leave a cleaner cut then that mower. Right tool for the job people, lawn mowers belong on the lawn, hedge trimmers belong up on the hedge bush lol.
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I bet he's the guy who parks nearest the entrance of Cow Bell restaurants! 
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What you have to take into account are regional differences and dialect. Being a Cheshire cat as a student at Sheffield Polytechnic was intrigued by the Yorkshire vocabulary of "gi' o'er" (phonetically, gior) (give over = stop that),
and "gi' us it" (phonetically gyusit) (give that to me).
A cowpat in Cheshire is a "wuzzer" (a cow was here). Also from Cheshire, someone sharing an observation that winged rats are in the vicinity, "Si thi mon, pidgeons" (See you man, pidgeons").
A standing driving joke between different counties is a driver from x changes gear at the bottom of the hill where a driver from y county changes gear half-way up the hill.
I assume you would get "GT GT's" driven at mower races 
. https://www.blmra.co.uk/
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Well, I thought more about an Bentley Continental GT or a Ford GT, hahaha!
York (as I said earlier).
In yorkshire they're called grass cutters, and grass trimmers.
At least they were when I lived there, from the 70s until the late 90s.
I never heard the word "Dude" either, other than a Mott the Hoople song.
Wow, that's some serious antique gardening kit!
The grass cutter in the first picture is what we call a 'Push Cutter".
As in 'Push Bike' - for Bicycle.
Yorkshire folk don't actually care what southerners call anything,
we have our own names for everything. =)
Aye, I'm aware of that.
The point I were making is that cm³ is not a unit of power.
also "cc" is anglocentric, in other germanic languages
cubic is Kubik, with a K. Square is Quadrat (german), kvadrat (swedish).
Scientific notation is universal. cm³, cm².
All motors should be rated in Watt.. anything else is outdated and meaningless.
And especially so when petrol is banned in Europe (the sooner the better).
Funny you should mention Ford Cortina -- the most common car in Yorkshire
back in the 80s. x)
My first car were a Mini Cooper (K Reg)
I am also a K Reg (K = 1971).
In North Yorkshire it's Give it me.
North, West, and South Yorkshire are very different dialects.
Sheffield (South Yorkshire) has always been industrial, North Yorkshire is mostly farmland.
In yorkshire we ga ta't pictures.
It's amazing how everything in America is "Awesome".
I wonder what they say when something truly is awesome (?)
Yet another US mystery.. what is an "Innernet"? is there an "Outernet"(?)
Here in Europa we have only an "INTERNET". (clearly we're being cheated).
England is losing it's englishness. I see kids in the UK holding one (middle) finger up, and not 2-fingers up (All is lost).
Even british anarchy is dying.
Among the people I know, the forum's censor won't allow me to share the answer to that question. "Holy" followed by a scatalogical expletive.
Did you mean holy 
?
That'd be the one, yes.
I would say something else.
Each to their own.
Holy Ravioli Batman
I should probably acknowledge that I work in the game industry and very coarse language is fairly common and not generally frowned upon outside of official meetings, or if directed at someone. I wouldn't be surprised if there are tamer options more frequently used by others.
I quit doing whole birds for Thanksgiving after a year when I had so much difficulty with one that my kitchen sounded like a Samuel L. Jackson movie.
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I used to own and work in a car body repair shop.
When something went wrong the language was meaningful to say the least.
I had one that appeared in the famous song:
It was a white four door. Just as I started Polytechnic it had to go for scrap as I could not afford the £200 to repair the McPherson struts!
The Salford Jets? xD
Joy Division is the only band I know from Salford, but they never did a song about a Ford Cortina. (for some reason).
200 pound to mend suspension? chuffing hell
Pity getting rid -- the car were in good nick otherwise?