I have a 2000 Vmax 700, 10,000K on it . Did all the cheap mods to it. Changed helix and rivets as Turk recommended and it runs very good now. I did change rivets several times to get rpm's down to 8400. Ended up with 4.5 grams in both holes. Springs are w-s-w and green @ 60*; 8ch weights. Your weights and gearing maybe a little different, Turk would know.