The extra hole on top is the hotstart, you dont need it but if you want it you will need another clutch perch and a hotstart cable. The 2 electrical plugs are the TPS (trottle position sensor) and the carb heater, obviously your wiring harness will not have a plug for these so i would imagine you could run without them, but i dont know too much about using a 450r carb on an ex. Oh and btw, you can just buy my bike and it already has everything plugged into the carb
Jonathan Watson #35
www.myspace.com/mx450r