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What worked for me is lean out (restrict) the IFRs until the idle corner screws are around 1.5 turns out. My 750dp jetted properly for wot only had the screws 3/4 turn out and was pig rich on the transfer slot. I don't have jettable ifrs so I have to use wire.
I have found the 750dp to be pig rich in the idle curcuit "stock", I left my IFRs alone & just increase the IABs about .006" front & .003" rear, this is on a 4 corner idle carb, now the front idle screws are 1.1/2 out & has a very clean idle.
My newer 650dp (2 corner idle) had .086" IABs (front) & .055" rear with .035" IFRs, they have really cleaned up the idle on these newer DPs, i had the idle screws out 3 turns & it was really nice, anytime the idle mix screws are 1 turn or less out on any of my holleys & start giving it more air to bring them out, of coarse you can also de-crease the IFRs also.
As for the part throttle AFR adjustment, playing with the PVCRs will help this area.
Last edited by joedust451; 06/11/12 11:09 PM.
