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Cr85 jetting questions

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Im not new to bikes but i have some newbie questions about my pitbike and its jetting. I have the air screw 1.5 turns out and it idles great but when u are on it and let off(with the clutch in) it will idle high then slowly, very slowly it will come back down to a normal idle. I just want to know whats up. Now my jets are 142 main and 45 pilot. Another question i have is when turning the air screw is "1" turn out 360 degrees or a half turn 180? So for instance is 1.5 turns out 540 degrees or 900 degrees?

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