Originally Posted by jbc426
Originally Posted by ademon
I did block the IAB on the outer carbs and the idle drops, so I'm pretty sure they add to the idle and also help to keep the fuel fresh if you never crack open the outer carbs.


Do your outboards have air/fuel adjustment screws on them? Mine don't. That's why I assumed they don't have idle circuits.


Old thread, but I found I put out bad info and I stand corrected. I've been advised that the outboard carbs do add fuel at idle. In fact, I had to ever so slightly crack the throttle blades open on them to lean out my idle. I also moved the IFR jet down below the fuel level, which dramatically stabilized my idle A/F ratio. I also had to lean them up a touch.

IFR jets.jpg
Last edited by jbc426; 05/01/20 11:37 AM.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)