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My '05's needles have only one clip groove, which is why adjustments have to made with shims. I haven't been around Ninja 250s long, but from what I know, it seems you have non-stock carbs, or someone changed your needles.
Needles I have that have multiple grooves have them 1mm apart. Methods vary, but you can get 1/2mm adjustments with 1/2mm shims or other nifty methods. But any shimming more than 1/2mm makes no sense.
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