Got my bike pretty much dialed. I can whack the throttle open right off idle and the bike will snap to life in an instant wheelspin. My problem lies in 1/8-1/4 throttle if held at the same throttle opening it runs rough like cutting out and then surges. Maybe I need to turn it one more click richer? I can never seem to get it to go away even when I turn it so rich that black smoke starts coming out on idle. Ive used new exhaust header gaskets so I think I can rule out an exhaust leak? Maybe I need to check the header/muffler junction? Any ideas peeps?