Suspension help!

I've got a '03 YZ450. I just measured my race sag and it's right at 4''. Then I measured my static sag and it was 2.25" :ride: That means my spring is much too stiff, right? The bikes suspension was done by Race Tech when I bought it. The spring is a Race Tech, it's silver in color and has this printed on it: 88078 622854. This is what it says on Race Techs web site for that spring: SRSP 622854 RT SHK SPR 63.4x60.6x270 5.4kg..... I'm 160LBS, can someone reccomend the correct spring? How hard is it to switch springs? Thanks, Steve.

*Edit* I just saw the suspension section and posted there. Sorry...

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