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NFPR Needle in 08 KTM 250 XCF

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OK I have a question? No one can seem to tell me what this needle taper is? I looked up the code andi t is out of a 08 YZF 250. Why would this needle be better thenthe stock needle OBETP?? I bought the bike used and i have recently put an HT racing 300 big bore kit in it. I am looking for some jetting advice I am at 2,5000 feet and usually only go to 5,000 feet. I am currently running a 45 pilot, 172 main and the leak jet is bolcked off. Any words of wisdom would be great, Thank you

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