Mikuni carburetor jetting.
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Mikuni needle jet orifice diameter.
The chart below lists the inside diameter of the needle jet in millimetres, ie an N-6 is 2.580mm ID.  This is true for every series of Mikuni needle jet, ie every N-6 is 2.580mm ID. Obviously the needle jet range is from N-0 as the leanest up to R-9 as the richest. Note that not every size is actually available in each and every series of needle jet -- this is just a size reference. 
There are some other sizes and markings used, ie #224 series are numbered AA-0, BB-0 etc, and they are not shown here.

 

-0

-1 -2 -3 -4 -5 -6 -7 -8 -9
N 2.550 2.555 2.560 2.565 2.570 2.575 2.580 2.585 2.590 2.595
O 2.600 2.605 2.610 2.615 2.620 2.625 2.630 2.635 2.640 2.645
P 2.650 2.655 2.660 2.665 2.670 2.675 2.680 2.685 2.690 2.695
Q 2.700 2.705 2.710 2.715 2.720 2.725 2.730 2.735 2.740 2.745
R 2.750 2.755 2.760 2.765 2.770 2.775 2.780 2.785 2.790

Mikuni main jet orifice diameter comparisons.




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