There's an article in the Aug 09 issue of Bike magazine (in the UK) about modifying the suspension on the Z750.
They got a suspension specialist to look at their long-term test Z750. On the rear shock, he replaced the rear 567 lb/in spring with a 525lb/in one, put the rear damping up to maximum and put in a spacer to give 10mm of preload with the standard adjuster on minimum.
On the front shocks, he replaced one 0.94kg/mm and one 0.95kg/mm fork spring with one 0.85 and one 0.9 fork spring respectively, set the damping at four clicks off maximum and put in a spacer to bring the total preload to 30mm of sag.
What, has anyone else done modify the suspension on their Z750?