I would do a +4 for the 75hp, and a revalved rear shock for the swing arm. Imo the link on the zilla is too close to the swing arm pivot and you are left with lots of leverage against it, especially when u extend the swing arm. Look at a trx250r or banshee, they have a longer link and the rear shock is more centered on the swing arm. Similar with all new 450 quads as well.