Looking to pick up a couple of these from Amazon:
Its going to control the choke and throttle for a small engine.
Would there be any issues running it?
Control is no problem. The only issue is that they need lots of power. A power supply separate from the Ardiono supply. Something like 6V and at least 3A per servo, maybe more.
Steve
Power supply is no problem, I have 17 amps engine alternator output capacity to play with 
Thanks!
Have no idea what this means.
High Rotation - well-controlled,180 degree rotation;360 degree rotation when power-off,
Something lost in the Chinese English translation I imagine however I'd look into it first if I were you.
Could simply mean it has some sort of optical feedback rather than the standard pot but usually this is a feature of rather expensive servos, not $17.00 units.
For rough and ready elcheapo you could go for these. I've use them many times in model boats etc. ( never aircraft)
$17 in what dollars? I paid the equivalent of USD 2-3 for those exact servos.
They can indeed do a full 180 degrees. Working well on 2xLiPo batteries. When powered off you can't rotate the shaft (easily; I didn't try to force it).
wvmarle:
$17 in what dollars? I paid the equivalent of USD 2-3 for those exact servos.
Well, the OP put a link to Amazon in his original post and that was what was listed there.
So US I guess.
wvmarle:
They can indeed do a full 180 degrees. Working well on 2xLiPo batteries. When powered off you can't rotate the shaft (easily; I didn't try to force it).
Again, the Op's post link showed the details I brought up about 360 degree rotation.
Your servo may well be different or there is an error in the Amazon listing.
Only quoting what I saw......... as they say, don't shoot the messenger.
Package as shown on the image including the type number printed on it is the same as the one I have on hand.
I've long learnt to distrust descriptions, where Amazon and eBay appear to be even worse than Aliexpress and Taobao, especially as in the latter case there's usually no translation to be done by the seller. Better to look for the part numbers (either given in the description or as seen on the product image - where the first is the more reliable in this case) and look up the data sheet.
Perhaps you should keep a more open mind as the one shown below also looks similar and in the video, it clearly shows what is stated in the Amazon listing , which is 360 degree rotation , no power.
Data sheets on most things from China are non-existent.
So basically, if, as you say, your item is " I paid the equivalent of USD 2-3 for those exact servos." then you are obviously mistaken.
"They can indeed do a full 180 degrees. Working well on 2xLiPo batteries. When powered off you can't rotate the shaft (easily; I didn't try to force it)."
Same package, brand and part number... that qualifies as "same" for most practical purposes.
What appears to be the manufacturer's page (at least the domain name matches the name, and part number is there as well) doesn't give a total rotation, but this document mentions 120° rotation for the same servo, which is quite certainly incorrect.
A bit further searching confirms the confusion: apparently it's available in 180 and 360° versions (see note at the bottom). Now why the two would have the same part number is beyond me, that's quite important difference in specification, imho. As was mentioned before the Amazon link description is also ambiguous about this.
So these servos are waterproof, a necessity in my application, are these 2-3 dollar servos also waterproof?
Rat_Patrol:
So these servos are waterproof, a necessity in my application, are these 2-3 dollar servos also waterproof?
Any servo maker claiming "waterproof" would have to be extremely optimistic.
Best one would hope for would be a small o'ring around the case lid at the bottom.
Normally they are ok for a bit of a water splash not submerged in a bucket of water, definitely not recommended for any exterior use. They also do not like too much vibration or heat so make allowance there also, perhaps mount remote from the engine itself.