Thanks for everyones advice when I was asking for help with carbies. Been having some problems and thought you might have some ideas. So basically we've cleaned carbies, new plugs, air filter clean and oil, new engine oil and filter, metho in tank, carb/injector cleaner in tank. At 4000+ rpm its missing (can hear popping in left exhaust only). This is making for slow throttle response, very poor performance, taking a long time to get revvs up, and sitting on constant rpm its jerky (bike moves back for a split second.. if that makes sense). Anyone have an idea as what might be the problem? Would carb sync or fuel/air mixture have something to do with this (note, didn't change that when doing carbs).