probly depends on what your doing with the bike.......long top end runs ect....on 92oct. 7#'s or less IMO. probly can get away with 9/10#'s on 92oct. for short bursts. always keep inmind that it costs a hell of alot more to rebuild/replace a toasted motor than to put whatever fuel ya need for what your doing
keep inmind also that just because ya got a 7# spring in it doesnt mean youll see 7#'s might really be 6#'s or it could boost creep to 10#'s depending on alot of things so keep that inmind aswell. this is why u see alot of toasted boosted motors IMO.....most people set it and forget it and things can and will change when there running them on edge
