Hey man 400 bucks and a running banshee is a deal. As others have stated you def. need to get a carb boot and a K&n filter. Cleaning the carbs would also benefit you cause as others have stated you probably sucked some dirt in there. If catastrophic damage was going to happen my bet would be it already would have. Before you go messing with the idle at least do/fix the boot, filter, and clean the carbs. Good luck man. Any questions were here to help
And one of the BHQ rules is, do not listen to this kid. He might trade you pipes though