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New to me, 08 crf250r jetting with power core 4 single. Pipe

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Hey just made the switch from blue, got an 08 with a single pipe, the power core. 4 ti, just wanted some jetting recommendations, I'm at sea level. 50-60 degrees right now. From searching it would seem like dropping to a 172-175 main would be recommend along with a 45 leak jet, and 42-45 pilot? Wasn't sure if the single pipe would make a difference or not? Are most running the stock needle and stock clip position? Thanks!

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Sounds like you got it. That seems to be the prefered jetting for most. I believe most are running the stock needle and clip position. Since its colder start with the 42 pilot and 172 main.

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