Yea I replaced the springs on my bike because I weigh 245 lbs and the the bike is set-up for a 160 lb rider. The rear is the most important and easiest to do. Race Tech will sell you a new spring for about $100. The forks suck to do if you don't have the right tools/experience. I would get a rear spring for your weight and set the sag and call it good if I were you.
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