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Message: [QUOTE="canyncarvr, post: 1079529, member: 16552"] re: 'Is the fork cap and rod nut in final position?? ' Matters not where the jam nut is if what you're doing is measuring up your preload spacer. re: 'measure the thickness of the two springs and the distance between coils as clearly, given the length mismatch, I need to confirm the spring really is a .38.' If you have some info on what the spring is made out of, how it was drawn, then I suppose the thickness and distance would tell you something. I don't know how much spring stock varies, but it sure ain't all the same. Length mismatch? One from the other? (I don't think that's what you mean). Different from some other measured XR spring? That's to be expected.........I'd expect. To measure the spring rate, makeup some cool tool consisting of PVC and/or dowel for guides, mark some given mm stopping point, squeeze the spring on a good scale and measure it up. That not meant to be unclear..but I'm sure you get the idea. The '98 XR400 is supposed to have a .38 spring. Curiously, RaceTech shows it to be a 3647 series spring, same as the KDX series..and 470mm long. Figures lie and liars figure! **edit** Ha! I KNEW it was 'out there', didn't think I'd find it!! ...you can thank me later: To figure spring rate: RATE 11.5 x Wire Diameter to the fourth power (D4) ÷ by 8 x Number of Active Coils x Mean Diameter cubed. From:[url=http://www.off-road.com/dirtbike/tech/2002spring/] [b]here![/b] [/url] Very good info there! [/QUOTE]

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