The rate is .40kg/mm. Those are in '00-01 xr400s, I THINK! You can check the rate at race techs website on the spring search program. I believe there is a different rate in earlier models. At least I know there's a change somewhere about that time.
re: "and what sixe xr on there kdx mine is 2002 200"
I have no idea what this means.
The springs that come from fredette aren't MADE by him.
re: your weight. .40s may well work. If you're an aggressive rider, you may be wanting a bit MORE spring.
Oh...if it's XR400 springs you're after, note that it's springs FROM honda for the XR400, NOT springs from eibach (or anyone else) that are MADE for the XR400.