Ok experts, these little 1407 4100kv brother Hobby have me stumped.
So I have to exact motors, 2 different brands of esc's .
On start up they stutter pretty bad unless you go to 30% throttle or more, once going you can go down to 5% or even less and fine but then when you go up to 50% or more it is like it has misfires all the way up to 100%. Lead wires are very thin I would say 20 gauge or less and they too get warm when you run it hard and this is with no prop on them so no load at all. With a prop on them the high speed misfire seems to go away but the start up stutter stays. I have resoldered all connections to, recalibrated the throttle on both esc's, again 2 same motors, 2 different brands of esc's and same issue with both. This is also on 3S and these motors are suppose to handle 4S with say a 3X4 prop . Mounting screws have plenty of clearance to the stator wires too.