The red is supposed to be based on the N3Cx needle. Blue loosely based on a DDK (same straight dia. with additional tapers).
The JD Blue from the generic kit, or older GasGas kit, is absolutely perfect in my 250 with the older 38mm AS I carb. Red is way too lean. Its probably too much to ask for it to work as well in the newer carb, as they are supposed to prefer leaner jetting. I wonder if the JD needles are different in the newer GG kit, or does he just package a different range of jets with the same needles and change the part #? I got so spoiled with my '07, just tried each needle, settled on the Blue in the middle clip, and just rode since '07 with just pilot and air screw changes when cold. I don't think anyone has experimented with a JD kit in a newer 250 with a 38mm AS II.
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