FYI (For those who are thinking, Mmmm I wonder?),
So I tried messin' with the sprocket ratio to see if I can gave a better feeling ratio.

First I tried -1 in the front and not much of a feeling of change, except my speedo was now reading 10mph over reality.

So then I kept the -1 in the front and went +2 in the rear and all that I can say is YUK! Powerband is now gone and my speedo is now of by +20 mph!

So today I went back to stock and I think it feels way better than the modified ratios I tried.

 

My bike came with a vortex 43t rear and I don't know what front but at anything below 50 it seems to be about 5-6 mph off. like I'm going 35 and it says 40 on my speedo. I think I'm going to get a factory size sprocket for the rear when I replace my rear tire (soon). Where did you get your sprockets?

 

Yea I sure that your speed would be different with that ratio. Although I think you're off in your estimation. A change from 15 to 14 in front and from 43 to 45 in the rear would only change the actual speed -7mph. I know it must seem like more, but thats the reality of it (or should I say the math of it).

 

I confirmed the speed error by radar gun. It was almost 20 off. Stock is almost 5 off.
Anyway, I have a couple new JT sprockets with less than 300 miles on them that I will sell for half price (Plus shipping) if anyone wants them.