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Which Needle

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I will be riding in Colorado next month, 6000 - 12000 feet, and am wondering which J.D. needle some of you would recommend? I have a 2007 WR250 with all free mods done and yz cams. I am going to jet the bike down to 168-166 main, 38 pilot jet and 40 leak jet. But I'm not sure which J.D. needle to useand which clip setting to put it on? I think the temps will be low 50's in the morning warming up to maybe very low 70's during the day. Anyone riding around this altitude and temps have any suggestions? Eddie or J.D.??

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