I have a 2001 YZ426 with BK mod, SLP power pack, and JD jetting kit. The bike starts on the first kick after sitting a week or two so the benefit of easier starting with 450 cam mod doesn't matter to me. Yes, I have read the 450 cam mod post above but was left wondering exactly what the other benefits are to this mod (i.e. some say better low end, smoother power delivery etc.) What is the consensus on the enhancements with the 450 cam?