Quad carb setup information help

rod7515 said

Rat, thanks for your response. I do believe the primary butterflies are totally closed on both carbs. I did verify that as I rebuilt both carbs. I have read some of those posts. Is that the starting point I should start setup or one that as I find a problem I move to. I don't want to make a change that I can't go back and redo.
Thanks Rod

Click to expand...

If the T slots have the correct exposure and it’s still fat at idle you’ll need to measure the idle feed restriction and see what it is. And measure the idle air bleed to see what it is. Then make a decision on what to change to get the idle cleaned up.

I went back and read your OP again. If the air/fuel mixture screws are not functioning it means it’s getting fuel and air from somewhere. Make sure the secondaries are open the same amount and not open too far.

If the T slots are correct and the secondaries aren’t open too much, the next step is to open up the idle air bleed by .006-.008 and see what you get. I say start there because you don’t have to pull the float bowl off to do that. If it gets better then you can take a look at the idle feed restriction.

The IAB and IFR work together. You may have to increase the IAB some and restrict the IFR some to get what you need rather than try and get it all done with the air bleed or the IFR.

At this point you most likely will need to drill and tap the IFR and IAB so you can replace the brass easier.