From the Bin o Facts --
According to Lee At Traxxion
There are two shock springs on the Gen1 and Gen2 FJR.
Specific to Lee's experience with the '05 (Gen1) and '06 (Gen2):
(Gen 1) '05 has a short 1400 lb/in spring AND a longer 670 lb spring.
On the soft setting, the two springs are used in series and provide a 440 lb/inch rating.
On the hard setting, the short spring is locked out and the single 670 lb spring is used.
(Gen II) '06 has a short 1800 lbs/inch spring AND the same 670 lb longer rate spring as the Gen I.
Learned from testing and measuring the (Gen II) '06 shock: The soft setting was upped from the Gen I to make it more useful to a wider range of riders while the hard setting was left unchanged from Gen I.
(Physical dimensions were exactly the same on the '05 Gen 1 and the '06 Gen II)
Both of these shocks are off of Gen II bikes.