Yep the knife edge is the way to go, it will increase airflow. Anything you do to reduce drag will increase preformance. After this get some CRAYTEX adrasive cones and polish the hell out of everything, mirror finish everything. Yes I know everyone says you have to have a rough surface to keep the fuel mixture in suspendtion but the distance it is traveling is so short and it will be traveling at a high rate. I did this to my kawasaki triples and they ran like a dream, AGAIN POLISH THE FUCK OUT THE ENTIRE INSIDE OF THE MOTOR. You will not be disappointed.