Keihin pwk needle codes ???

[evo550]

I'm trying to decipher some keihin needle codes 
Anyone know which is the leanest out of this bunch: N2ZW, N2ZJ, N2ZK, N2ZL.
Anyone know how to read the codes?

[Tim754]

http://www.duncanracing.com/TechCenter/KeihinCarbJetting.pdf
Try the link above for ten pages of info Evo

[evo550]

Thanks Tim,
Good easy to understand explination, and it seems I'm on the right track.
The codes must be KTM specific (for a new 300  ) Unfortunately the manual doesn't advise on how to determine which needle is richer and what is leaner.

[JohnnyO]

With a KTM the needles get leaner as you get further down the alphabet.
A= rich  Z= lean

[evo550]

Any idea what the number and the second letter are, as the spares kit also has a N8RW, N3RJ and N3RK...I think, (I'm at work right now.)
I ended up getting the verniers out last night and measuring them all at 3 identical points to find the thickest, which I think would be the leanest, and dropped that in. That has cleaned it up somewhat but stll blubbery at about 1/2 to 3/4 throttle, set on middle clip.

[Honda Hoarder]

Goggle Show and go bikes in SA or WA call them they will tell you. They are the Australian dealer for PWK and Kehin