Greetings all: XR650R noob (love the bike) here with a question: The 2000 I just bought bogs off idle very badly, as if it were going to die, then it kicks you in the ass! It has a Mikuni pumper carb on it, which I understand is supposed to care of this problem. White Bros E series exhaust, UNI filter (no holes in the airbox) stock engine. Suggestions? Thanks!