Don´t know if this is off topic and maybe someone else already post it, but I wanted to share it with you. The carbs are functional bells activated from the grip. It´s from a site called ratrodbikes.com. Hope you like it!
http://s82.photobucket.com/albums/j255/karfer67/bike stuff/?action=view¤t=ebay722007.flv Here is the link where you can see the carbs bells!