I tested each motor/ESC combination, one at a time, before installing them on the x230 frame. In this manner, I could calibrate the throttle range on each ESC to my JR x9503 transmitter and set the proper motor rotation for M1-M4.

The EC3 connector on my ParkZone 3s 1300mAh pack made it easy to temporarily hold the ESC battery pins inside the barrels for testing. Labeling the control cables with M1-M4 makes it easier to plug them into the FC later on. The green tape on the frame arms denotes the front of the quad.

4 screws for mounting each motor to the frame arm were also supplied in the kit.