Hey guys, I was just wondering if anybody knows spring rates on the new yz450. I am about to purchase one and I read that you can do all the tuning you want, but without the proper spring rate on the back you will never get the bike working as well as it can. I am 155 lbs, will i need to put a different shock spring on there? I am trying to learn to setup my own suspension. Any suggestions would be appreciated. Thanks!