You cant rell someone a main jet size to run in thier bike. That is something they have to do themselves, there are too many factors in determining jetting and someone else telling you what to run isnt going to work. And The needle clip doesnt affect jetting in the 3/4 to open range, which is where he is having problems. Since it has gotten cloder recently i would assume that it is running lean. I would suggest going up a size first, just to be safe, and see if it gets better. If it gets worse go down a size untill it gets better. And make sure you have a clean air filter when you test it