I wish I knew. I've been fighting carb problems for almost a year now. It helps to be good at generating mathematical permutations so you can try every conceivable shooter, pump cam, jet configuration and power valve made in your futile attempts at trying to get it to run right.

I've done a total reset on mine twice and gone completely back to the out of the box set up and started over. That hasn't really helped much but I felt better afterwards, LOL.