CARBKING, please respond.
Update. The backfiring is fixed. The linkage is now straight, and the progressive is removed. I still get a hesitation when low in the RPM's. When going up a hill, the power is not there. So, I pulled all three pairs of main jets to measure. They are all reading between .046 - .047" diameter. I was told that since there is so much carb, the velocity is not there, and need to open up the jet size. Do you agree, or should I look at something else at this point??