Problem with Mighty Demon 750

I know this is an old thread but I thought I'd chime in.
You HAVE to lean out the IFR's on a Demon carb they are rediculously rich from the factory. Mine are at .028 if memory serves me correctly. Get the IFR's set before anything else. My target is to get the primary butterflies set to 1 turn in by replacing the IFR's to get to this point. I then fine tune from there if needed by altering the IFR air bleeds as required. Take your time, it'll be needed to properly tune the entire carb. If you're like me as you get into it you'll find that you'll get into it more and more and start tuning stuff you never thought you'd get into... it's fun! A O2 sensor is gods gift to carb tuning. No more guessing. The numbers tell you everything you'd want to know. The more you use it the more you understand it and the easier it is to tune.

After the IFR's are dialed in then get your cruise circuit set, check your vacuum at cruise once dialed in then make sure your PV is 2# below your average cruise reading. Then fine tune cruise in with the HSAB's. Then adjust the main jets for max power or some people (I am one of them) adjust the PVRC instead of the main jets at this point to help get a linear (flat) fuel curve across the entire RPM range. Then move on to the emulsion wells to get the fuel curve FLAT. You should only need to adjust the emulsion wells if you have an issue like you are rich down low, then get lean at mid RPM's, and then go back to rich at high RPM's for example though. Typically this is only if you really want to dial in the carb 100%. I'm a gear head so it's what I do. :-) It's pain staking and time consuming but the end result is a carb that is unbelievably easy to tweak at the track which is where the remaining tuning that you will need to do needs to be done (main/secondary jets). Set for trap speed NOT ET.

I use to live in Columbus but moved, too bad we could of had a few beers and dialed your car in. :-(

Mopar to you!