Had to put a 210 main - 4th clip on the needle - AF at 2 5/8. I just came back from a run and the plugs are good. If anything, it is running a little leaner than it was. I think I still have to tweek the AF a little more.
With the stock air box I was running a 185 main - 3rd clip - AF at 2. It was running a little rich at these settings. Any bigger main smoked like hell and turned the plugs black.
What a difference air makes.