I think the only way to lower it safely is buy changing out the stock triple tree.
buy a tree for under 2 bills and you can lower it as much as you want and put it back and so forth and its easy and blingy if you get a nice one
With the triple tree or spacers from soupys, don't you need to loosen the 12mm bolts on the lower tree regardless? (the one that's hard to reach?
I've mounted an after market top triple tree cover to allow the tubes to pass through the top tree, so i'm ready to drop mine. How can i best assure every thing is lowered evenly?
Mark(permanent marker is fine,they won't be noticed) the tubes at the top of the "Lower" triple tree clamp before you loosen anything. Loosen the bolts.Don't need to totally loosen them,just enough to let tubes slide. Let the tubes move to where you want them. Measure the marks to make sure they even distance from the lower tree. Tighten her back up. Don't over tighten them. Forget the rated torque spec.
Pretty much all general info you'll need is in this section of the forums. Just gotta poke around a bit...
Maintenance and Do-It-Yourself - Hayabusa.oRg
but I notices from the design of it that if instead you remove the stock bars clamps and took it to a machine shop and had the hole opened up so the forks could pass through you could accomplish the same thing for alot less money, at least I am guessing the machine work would be less than the cost of a new unit.