Hey there I need some help tuning this bike. All stock except for e White Bros E Series exhaust. I can't get the bike to idle right and it back fires quite a bit when I get out of the gas. I cleaned the carb and checked for any air leaks and found nothing. I don't believe that the jetting has ever been changed to compensate for the exhaust but I was told that it does not have to be. It does have a 180 main jet. I bought this bike a few years ago and have ridden it very little. I would say that the bike has less that 25-30 hours on it. It did idle fine when i got it but allways had the back fire issue. Any help you can give me is appreciated.