This guy here
Originally Posted by reollc4
It looks like i may be able to use the 510 springs, I'd really like to hear from someone who has done this.
had some 510 springs and returned them, but it doesn't seem that he actually tried them.
If your springs are new, I'd sell them and put the money towards new springs. If they've already been used, you have nothing to lose by trying them out. Just install them. The suspension should sag a little with just the weight of the bike on it. If the forks stay topped out, then there is too much preload.