I was a idiot.Only after chewing through 2 third servo gear, 3 fourth gear and a pair of mosfet do i realized the servo motor I used was wrong. Finally get the servo into my pn2.5... With one of my sports 2 as a donor for servo motor.. Lets hope the ezrun 18A esc wont giveme any further trouble. I guess the lesson learned is dont trying to save too.much money, otherwise you will end up wasting more money and have a lot of frustration...