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I've always struggled with what color of springs to put in. the springs in my sled are stock and the weights are 69 gram and the secondary sring is in the second hole (one tighter than center). my rpm's are 7200-7400 approx when i'm in the hills but i dont like how it back shifts. im 6' tall but pretty heavy at 290lbs with a pack of junk. this is on a 04 900 mtn cat 159. i only have the attac, Y pipe, mbrp can, slp intake, and skidoo style exhaust valves. What color springs should a guy try? the ramps in the scondary are stock as well. thanks