I have a 05 600 edge touring, I don't do much 2up riding but like the long track. A buddy of mine with a 04 xcsp600 and I were comparing clutch specs the 05 has 64g wieght blk/green spring in the primary and a 64/42-65 helix with a red/ green spring. The 04 has 58g weights & a blue/white spring primary and 58/42-36 with red blue in the secondary. So here is what I done so far on my 05 changed gears from 21/41 to 23/40, drop to 60g wieght and from 420 jets to 400. Now just wondering if I should be changing helix ? Also was told that a change in valve springs may help performance ? and help or direction will be great. Thanks for now.