Jake,
One thing to note is this is an '05 250 with the older carb, and tends to like richer jetting. I'm thinking that the "W" straight section might be too lean. A JD Red with the same dia is way too lean to run in my bike. I'd work with specs that have a good history on pre ASII carb 250s like mine.
theException_03,
Your conditions are exactly like mine but a little drier. If you can get hold of a JD Blue needle, try it, you should be very happy. A common DDK should get you in the ballpark as well.
I'd start(assuming you have a #7 slide):
JD Blue or DDK #3
45 pilot
180 main
air screw 1.5 out
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