Needles are supposed to be different.

http://tech.nsr-world.com/nsr/nsr-all/carb-settings/

It's unlikely they will wear enough to effect carburetion a great deal. They will have been discontinued a long time ago, so your best bet would be another set of carbs, although the needles in those will also be 21 years old!

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Andy.
NSR-WORLD.COM

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