4-Max
The Electric Flight Specialists

Purple Power Brushless Motors

Notes on Selecting a Motor

As with all things, it's best not to run motors right on their limit especially if there is limited cooling. As a rule of thumb if you need 400W then chose a motor with 15-20% extra capacity i.e. around 460W-480W.

Please Read
If a motor doesn't start immediately you must cut power immediately, or you will destroy the motor and/or ESC and/or battery within a second or two and it really can be that quick.
A brushless motor is actually a 3 phase AC motor. If the motor rocks back and forth but does not rotate, this means there is a problem with one of the phases and as mentioned before the power must be cut immediately or you will burn the Motor/ESC/Battery out with a second or two.
The main cause for this problem is a poor or dry solder joint on one of the wires and/or connectors between the ESC and motor. Re-solder these wires/connectors with fresh solder make sure the wires are well tinned and very hot.