My take on C14 Susp Setting:
Static sag adjusted in the shop can do so much. Your motorcycle is a dynamic vehicle and will experience much greater vertical forces/accelerations while running down the road than standing still in a shop.
On the C14, Spring Preload is adjustable both front/rear, Compression Dampening is fixed and Rebound Dampening is adjustable both front/rear. (consult your operators manual for means of adjusting these
http://kawasaki.com/DefaultFrame.aspx?strContentURL=/SITE/VIVEHICLEINFORMATION/VICHOOSEVEHICLE.ASP )
I reduce preload and rebound on both front and rear. I feel it is easier to start soft and bouncy and work your way up in preload and rebound. My C14 now feel like my grandpa Buick.
SPRING PRELOAD
Spring Preload and Compression Dampening work in the same direction; providing resistance to sag. If you try to adjust your spring preload with small sharp bumps you'll get a compounded reaction of both Spring Preload and Compression Dampening, making it difficult to identify the effect of changes in Spring Preload.
The ideal terrain to fine tune your spring preload is a curve that includes a high amplitude and long wavelength bump (a long and deep bump, like a large swell on the ocean). Combining the "swell" with a curve will simulate an elevated vertical load. The slow and long "swell" bump will provide enough decoupling from the compression dampening so that you can concentrate on spring preload.
You should dial just enough preload so that the suspension doesn't bottom out but a the same time absorbs the bump.
REBOUND DAMPENING
Finish off by dialing in the rebound dampening on varied road surfaces. Sufficient rebound dampening will limit the bikes reaction to a single oscillation. Too much will make the bike choppy as the suspension will not recover rapidly enough for the next bump.
FWD/AFT BALANCE
Care is needed to balance these adjustments on both front and rear so that they work together.
If you're having problem finding an adequate balance between front and rear, re-soften one of the two and work your way back to proper adjustments.
Have fun.