My EZ start system has a problem where when I first hit the button, the motor spins over the engine, but then it slows down and stops. It's not the battery because I charged it fully, it's not the motor or the wires because I replaced them, and it's not the wand because I tried my friends and it happened also. I've tried a new battery. I took apart the EZ start when I changed the motor and made sure that there wasn't something catching in there. What could it be?