For motor to be suitable for esk8 it must meet several conditions:
- lightweight and compact enouhg to fit your build
- motor mounting must fit your brackets unless you make custom ones
- powerful enough to give some fun (above 1000W generally, sometimes over 5000W)
- correct motor voltage and KV
most builds novadays are run with either 10s or 12s systems, meaning 30-50 volts battery voltage.
Motor must work correctly with said voltage and be spinning with manageable speed, so you do not have to gear it down too much (limits to about 7:1 single step drive either belt, chain or gear)
which gives target motor KV in 150 to 250 range (means 150 to 250 rpm per volt of supply voltage).
Which means you cannot use drone motors with very high KV of 500 or above bencause then it would require too much gearing to work (despite such motors being very lightweight compared to their power). If such motor is used without correct gearing it wont develop its rated power and board will be sluggish on level and still on any inclines.
Another thing is to include motor/maker/brand reliability - do not buy nameless crap unless you want to buy twice and crash due to some failure.
So unless you are a crackpot who makes/rewinds motors before dinner stick to the above. Find good deal fitting your target power and stick to it.