I have added handlebar risers to maybe a half dozen bikes in my life. Some were easy, some were a nightmare. Seems that once you approach 2 inches you entered a new world with longer cables, brake lines, etc.
Why is it relatively easy to add 4 inch risers or less on the newer 2011/2012 ABS models? Did Kasasaki design these bikes with longer cables and lines knowing risers would be installed?