The splines inside of the grip that line up on the drive by wire splines on the end of my handlebars are too long. In fact almost twice as long as they should be. Because they are so long they bind on the bar and the throttle hangs up and will not return. (So your throttle hangs wide open) This is the 4th set of grips I have put on my bike and are also the only set I have ever had this issue with. It seems to be a manufacturing issue.