N-X-Y-Z (N3EJ) (NEDW) (NOZI) (N1EF)
N - OEM Needle identifier
X - Taper profile
Y - Clip position/length
Z - Diameter
The X/Y doesn't seem to share any common ground between needles. 3 is 2 taper needle. E is 3 taper, O is 3 taper, 1 is the stock GG needle also a 3 taper. I'm not sure if the tapers are the same between the NOZ/N1E. They do feel very similar. The Y part which indicates clip pos/length is also paired up with the taper profile (x) to form a needle with the same properties that allows for half clip adjustments. Exmaples N3Ex/N3Cx, NEDx/NECx. I have a feeling NOZx/N1Ex is the exception and are half clip different using the same taper.
Z is the needle diameter of the straight section of the needle. It covers idle to 1/8-1/4 depending on the needles taper profile. Sizes range from:
Nxxx needle diameters
D=2.685mm
E=2.695mm (JD Blue)
F=2.705mm
G= 2.715
H= 2.725
W/I=2.735 (JD Red)
J= 2.745
K=2.755
Suzuki come stock with the NExx needles. Ktm use NOZx or N8xx (same taper profile as the N3xx). TM, Sherco, Beta all share needles too, so I don't know if anyone really 'owns' anything.
All these needles are the same 2 taper profile, with varying lengths:
In 1/2 clip variations from leanest to richest they are...
N89x=leanest
N3Cx
N3Ex
N8Rx
N2Zx
N4Dx
N3Vx
N4Ax
N6Mx=richest
They share no similarities with Keihin/Sudco needles. You'll be able to cross reference the diameter and that is it. Keihin needles are a single taper. The angle of that taper is part of their naming.
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