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Dynojet / Keihin needle jet difference crf250r

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So I've got a 05 crf250r with a 06 bottom end, and the "05" FCR01B carburetor. Bike has been gone through completely, and has a hotrod crank & bearings. A Cylinder Works 269cc big bore kit. And a fresh head. 

Heres my question,

What's the difference between an OEM Keihin NCYQ needle jet, and a Dynojet DNO983 needle?

The dynojet needle came with the DJ stage 1 jet kit for the "2005".

According to the manual every year from 04-09 has a different part number. Anyone care to shed some light on this for me aswell?


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Every year had a different head too, so the needle change was needed.

If you look up the Keihin needle codes on google, you can see what the specific changes were.

There is no Dynojet needle code sheet or comparison sheet that I could find.



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