Maintenance specifications for the 1KT/2MA TZR250.
Here are the specifications and jet sizes for the stock 28mm carbs.
carburator body
main jet
needle jet
jet needle
pilot jet
air correction jet
air jet vent
power jet
Mikuni TM28SS
230 hex
Q-2, series 505
5L19, clip position 2
20, bleed type
1.5 press in jet
open with hose
60
I've dug up most of the info on the F3 racing kit that was available back in the late 80's.
It's no longer available, which is too bad, I heard it worked very well.