Jetting area would be good! Don't know why I didn't think of this before..but this thread is GREAT on needles. Not just 'this for that' but general stuff.
This from JD I think sums the whole KDX needle problem:
JD wrote:I will go out on a limb and speculate that Kawasaki thought this would be a sweet play bike and need very clean jetting. So they put a lean straight diameter (2.725, or 2.735) , a lean taper (1.25 degrees) , and a lean clip position (L1=39.95) and then came up with 1172N or 1173N. The higher taper start is throwing you guys off track by being lean then rich then lean in an extreme and (to date) unexplained way.
It CAN be explained!! Explanation is, the OEM needle is all screwed up!!
Both posts appear to be the same info.
Gearloose differentiated his with lines, arrows and memos on the back of each one!
There are post numbers that would enable someone making a reference to a spot, too. Well, dates would work too.
I like Gear's better!

The FONT is prettier, too!!
Many more pages..but that's a formatting issue...