What is the difference between the kits JD, FMF ect... Is there something I'm missing here? A jet is a jet isn't it? Tell me if I'm wrong but a crude description of a jet is a small brass plug with a metered orifice. So..... What would make one kit better than another? Is it the tuning instructions? That maybe I could understand but i find it hard to believe that one company is going to make a jet better than another. Please give me your opinions as I am very interested in possibly re-jetting my carb. I should note that my bike runs damn near perfect so far as I do not have any hesitation so I suppose driveabuility is damn near perfect however one could always use more response and power. I could use some more top end and come to think of it some bottom end and midrange would be nice too . So give me you advise and opinions on this please..