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Jetting for 05 CRF250

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I had a White Bros Carbon Pro pipe installed on my 05 CRF250 and the jetting kit was 150 main and 40 pilot. The guy who installed it said that the 150 seems very lean. So we decided to leave it stock. I hate to spend $800 for a pipe and not get the most out of it, because of the jetting being wrong. The stock jetting is 172 main and 42 pilot. I live in new orleans and were below sea level, do you have any suggestions on how to jet it correctly? Thanks.

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