They werent on my buddys 1992 xtz660.
Adding spaccers is fine, but then you wont use al of the fork travel, making it worse for offroading. If it's bottoming out, something is worn, bad, og not enough oil.
peaople tend to use more, and thicker oil, cause whats already mentioned. Just get the spring and be done with it.
Sidenote: The springs on my 2003 xt600e was progressive, but not as much as the wilbers, and because the wilbers springs are longer and you can loose the big pipe-spaccer, you get much better suspension.
Its a real shame that i cant find the pics of the difference, its one of those "a picture is worth a thousand words" thing.
**** me, I found the pic, this is the 1992 xtz.
You tell me what ya thing works best:
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