Ok I know there are a lot of threads on here about tuning your carburettor and maintaining everything, but I haven't seen one that addresses this specific problem so here it goes. I hit the 350 mile mark on my bike a few days ago and have noticed something weird. I'll be riding at about 3/4 throttle and if I keep the throttle there for more than 10 seconds the bike will sound like it's "bogging." Not sure if anyone is familiar with what I'm talking about but it the engine runs, and then brrrrrrrrr then it runs smooth again but it goes back to brrrrrrrrr. It's weird and really annoying. Does this mean I have an air leak or something? Maybe the carbs dirty and needs some carb cleaner? Any ideas?