...The A model has a much higher rear spring rate, but it is the hard/soft lever adjustment only. Most of the time I'd say you're OK with soft on a Gen III, and would use hard for two up. ....
Forgive me if I'm wrong,
but I understood that the "hard/soft" on the Gen II is a preload adjustment, the "hard/standard/soft" on a Gen III is damping, the preload being done with the "Rider-only/rider-with-luggage/two-up/two-up-with-luggage".With my not-very-portly 145 pounds, I find "rider-only", then soft on highways, and hard on twisties or bad surfaces. I rarely use "standard". (I've not yet started playing with the "+/-3" damping modifiers.)
The hard/soft on the GEN1, GEN2, and the GEN3 A models is not a preload adjustment all though everyone, including Yamaha calls it a preload. Those shocks have two springs that work in series in the soft position but only one working spring in the hard position. The result is two very different spring rates, neither of which has a preload adjustment. Its a true dual rate system that works very well if the individual spring rates fit the needs of the rider when riding solo or 2-up. The GEN1 and GEN2 shocks were badly under sprung for all but the lightest riders, the GEN3 shock is made for the big boys.
Thanks for the edumucation.
My experience so far with my AS (AE in the 'States if they did one) that has the ES suspension (AE in the UK) is that when I first rode it home from the dealer, I had it on rider only, standard. Half-way home I was thinking, "What the hell have I done? This thing's bucking as if the font and rear suspensions are on a totally different wavelength".
Having got home, read a bit of stuff, went out round a loop that I know well that has corners and humps and bumps. When I tried "hard", all was forgiven. I could feel every road imperfection, but the bike tracked like my Gen II never did. Then on the slab, the "soft" setting smoothed out the imperfections, so was more comfortable. I've yet to try fiddling with the "+/-" settings.
The result is a little worrying. There's a corner near home that I go round frequently. The road used to be a 40mph limit, it's now 30. On this corner, with my Gen II, I wasn't happy even reaching the old 40 limit. The last few times on my Gen III, I've glanced at my speedometer, 45, with absolutely no sign of it being too fast. Apart, that is, for that new "30" sign. As many have commented, this suspension is a big improvement, even for an (apparently) under-weight, non-peg-dragger (well, not very often) such as myself.
Talking of peg-dragging, the hero-blobs on the Gen III are longer than those on the Gen II. Not sure why.
(Click on image for larger view)
Gen II . . . . . . . . . . . . . . . . . . . . . Gen III