I'm after a yamaha zeal and many on the market atm have the front wind shield (cowling) while others have the traditional open headlight. As I'm after one with the open headlight, I was wondering what's involved in removing the cowling and installing the headlight. From what I kno, underneath the screen there are dual lights which seem specifically designed for the cowling. So what's involved in installing a new headlight? S'it a costly operation?