on my 07 I jacked with all sorts of different needle/pilot/screw/main combos for a couple years, same problems you are having. I finally broke down and bought the JD needle kit and it still sucked. I called JD and he sent me a fatter needle, the rationale was my bike likely had very high time on it (I am the third owner) and the "needle jet" as he described it gets worn out from the needle going in and out of it. So he suggested a new carb OR to try a fatter needle (which he sent to me at no cost). In my case, he was right, and the fatter needle fixed it. Now it runs clean at all throttle positions
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07 GG EC300
11 GG EC300E
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