Recently my bike began fast idling cold/or hot and when revved popping on deceleration. The jetting hasn't been recently changed, there has not been a recent change in whether and the bike has been setup how it is for as long as I've had it. The only thing I can think of is off and on I've used VP U4 and maybe the jets are not true because of gumming. I haven't taken the carb apart but before I do I was looking for a little feedback from the bluecrew to assist. Thanks in advance My bike is a 98 yz420, ported head and full pc ex. system.