the primary should have 3 colored paint markings on it too. (if its a yamaha spring) They do wear off sometimes though, but you can usually still find some of it still there. I think stock would be a yellow green yellow on that sled if its still stock. the green secondary is also stock for that sled. you can replace that with a yamaha green. check to see what weights are in the primary and what helix on the secondary. that will help determine primary spring to run.