Picked up a 2004 Demo 9 last fall. I have about 5 rides on the bike at North Star this year. My rear DHX 5.0 has a 400 x 3.25 spring. With gear on I weigh in at 212lbs. Just looking for some other Demo 9 guys who are riding with a DHX 5.0. What is your rear spring rate? And how much do you weigh? I think I need at least 450lb or 500lb spring. Thanks in advance....