new front fork springs for a 2000 rm 250

I got a 00' rm 250 and the front forks are way to stiff. I softened them up all the way and theyre too stiff for me. Im about 130lbs. The owner before me put factory connection springs in, some stiffer ones im assuming..Im putting new fork seals in so while everything is apart I would like to put softer springs in and im just wondering what springs i should get for my weight? I know i can get spring ranging from .40kg-.50kg but im not that knowledgable on this subject. can anyone point me out on what springs to get or any suggestion would be appreciated.
Thanks
-Andreas

ok thank you.