Not Ranked
I have a Pro-Systems carb and so far it is very responsive to changes. Patrick is helping me get mine dialed in with the use of an LM-1.
For a WOT dyno pull, your numbers don't seem to far off; as long as the 13 is not over 13.3. As mentioned in the previous post it can be several items causing the rich spike at 4100, but that may be OK because you want a lower air fuel ratio right around your peak torque number. Hopefully, closer to 11.8 to 12.2 at peak torque.
If you want to tune your carb more, I would either schedule some dyno time or find a wide band that you can use. Start with your idle mixture, then WOT, and finally drivability and fuel economy.
So far I like the Pro System carb much better than the other double pumpers and the Avenger that I had.
Good luck,
Justin
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