[Kampfer]

ICS motors are sometimes full of problems.
When you take your ICS motor out can you spin the pinion gear with your finger? or do you feel it grinding inside?
Does your motor heat up a lot?
Getting 40 shots then slow to a stop could also mean a battery problem do you have another gun to test your battery with?
connect your battery and wire to the motor with out puting it in the grip to see if the motor is working properly. (make sure you hold on to the motor tight or it's jump around.)