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Old June 26th, 2011, 03:51 AM   #1
Rizod
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Anyone know the stock fork spring rate?

I tried searching but cant find it. Even race tech doesnt have it.
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Old June 26th, 2011, 09:27 AM   #2
greg737
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I know the pre-gen bikes (up till 2007) came with .44 kg/mm springs. I doubt Kawasaki would have upped the spring rate by too much over that in the 2008 re-design.

In the pre-gen bikes it seems that people always prefered more (by a pretty good bit) spring rate than the stock setup: 160 pound or less guys tend to go .65 kg/mm, 170 to 190 pound guys using .70 to .75 kg/mm, and the heavy boys on .75, .80 or even .85 kg/mm.

Last futzed with by greg737; June 26th, 2011 at 10:39 AM.
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Old June 26th, 2011, 10:41 AM   #3
Alex
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Greg - I'm having a hard time finding the spec as well, but IIRC, this was one of the areas that was significantly changed during the re-design. Fork dive is significantly less on the new-gen, and some of the early reviews put that to a higher spring rate up front. But I hope someone can track down the numbers...
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Old January 29th, 2012, 07:57 AM   #4
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bump ? anyone know ?
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Old January 29th, 2012, 08:16 AM   #5
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Oh, when I got new springs a while ago and was going back and forth with the guys at Traxxion Dynamics to get a proper spring rate for my weight, they told me that the pregen's spring rate measured at .44, but the stock 08+ 250s measured at .65. I've never seen anything official from kawasaki regarding it, so I can't say for sure, but I'm willing to take their word for it.
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Old January 30th, 2012, 08:12 AM   #6
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Check the MOM under specs, and also check the service manual. It is sometimes listed under one or the other (although I doubt it's in the MOM). I don't have ready access to mine or I'd look it up.
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Old January 30th, 2012, 10:18 AM   #7
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It's not in either of those. Zombiphone's numbers seem reasonable.
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Old April 10th, 2012, 11:18 AM   #8
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I just measured some at about .64. I would think .65 is correct. Certainly not .44...
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Old April 10th, 2012, 05:42 PM   #9
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