Originally Posted by Stobie
The problem with sourcing fork springs is that, even though our bikes use the same basic 4860 WP fork as the '03 and '04 EXC/MXC's, it's set up internally for a 43mm x 485mm spring, instead of the 43mm x 510 mm spring of the RFS bikes, and it's not just a swap of preload spacers. The 510's won't fit without way too much preload being put on them. The one's Mx-Tech has on the shelf are 495mm, and there is plenty of room for that. I just hope the wire diameter isn't too large.
I put a pair of .46 springs in, I ordered from Enduro Engineering and didn't notice the difference. They seem to be working ok, so I'm not going to take them out.