I really don't understand the difference between these bikes. I heard the wr is the same as the yzf with another gear? Do the bikes pull the same? I have a 04 yz450f and I race cross country. So far this bike is great but would really like the light and extra gear . Is the suspesion the same and how much of a weight difference. Or just point me in the direction where I can find the info. Thanks much.