we have another thread going on about this on the DL1000 forum so you might read through that. If you are using the stock grips, the CC4 will not fit at first. The grips go over a flange on the inside of the throttle tube. You have to move the rubber outward off this flange. This allows room for the CC4 to fit. I took the stock grips off because they were too small diameter anyway and replaced them with some foam grips so I don't have this issue but this could be your problem.
Present: Blue DL1000
Past Street: Yam 1984 RZ350 Kenny Roberts
Suzuki 1984 GS450E
Kaw 550 LTD
Past Dirt: 1984 KDX200