One critera to remember is the more chain and bigger the Bar, the more Drag there is on the motor.
Some years ago I bought a fairly cheap chain saw sharpener ($50?) that holds the bar and has an electric motor driving a disc to sharpen the teeth and that has paid for itself many many times.
I dont care how powerful a motor you have, a blunt chain with the wrong cut makes it less useful than an axe.
Also consider just how many times do you want to use such a devise for you to consider ELECTRIC, Hiring one or even getting someone in to do the job for you.
It may be just me but I believe the Law regarding petrol driven Chain Saws, Lawn Mowers, Whipper snippers etc is that for every 1 minute it works will take one HOUR of pulling, cleaning,fueling,clean the filter and spark plug (if you can find where the hell the spark plug spanner has been put THIS TIME !!!) then storing it away after use (if it did actually start).
Comparisons are under $300 is a Toy but for something that will work reliably start around $800 which is a lot for around 4 hours of use each year.
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