I recently purchased a 2002 XR400. It has the 426 kit installed, with Edelbrock pumper carb, stock Gordoned header pipe and Pro-Circuit muffler. It has the Stage 2 Hotcam in it as well. What is the diff between the stage 1,2, and 3 Hotcams? I have yet to really get a chance to seriously ride the bike beyond what I did while purchasing it. What will this Stage 2 cam do for the bike? It does seem to rev higher than my other stock XR400. It even wheelied in 3rd with a throttle blip at speed. Thanks in advance!