I just picked up my son's 07 125 and immediately put a JD Jet kit in it and I installed it with the blue needle, 2nd clip (slightly richer than the red needle third) to be safe. The bike runs awesome and throttle response is crispt but I have noticed one weird thing. Especially under a load, there is a momentary bog or hesitation at around half or 3/4 throttle. That, I assume would mean it is the needle but I am not sure if it is rich or lean spot because the plug looks perfect. I am in the flat ole Midwest (Indiana). When your riding it hard on the pipe you really do not notice it but I let someone else ride it (who is fast) without telling him anything and he came back and said it had a throttle position related stumble. Strange. I did send James an e-mail but he has been out of town. Any thoughts here? This is not a huge deal but if I can get rid of it that would be great.