What rear shock spring rate?

I have a 07 kx 450f, I bought it used and don't know current spring rate. My race sag is 100mm, free sag is 38mm...which means I need a softer spring eventually. Is there a way to look at spring and know rate? I weigh around 155lbs without gear. What spring rate should I buy? Thanks

Those sags are good

Ya, the bike feels good for the most part, the rear was swapping a bit at high speed so I adjusted the sag a little and put it right at 100mm...it was somewhere in the 90's, I may end up closer to 105mm when I'm satisfied. Thanks

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