The #51 .067" is way to large for a MAB and explains why the PMJ and SMJ are so small. The previous owner made the mistake of trying to lean a 750 to work on a mild engine.
This is what I would do:
- Get your ignition curve set. Your combo needs more initial timing to clean up idle and throttle response. Get initial around 26* and total mech 34*.
- Move the #51 .067" air bleeds to the outer holes (IAB)
- Put the new .039 air bleeds you bought in the inner holes (MAB)
- Use a 65 PV up front, leave rear plugged.
- Change primary main jet (PMJ) to 75, change secondary main jet (SMJ) to 83
- Set the throttle blades up front to .020, set rear blades to the point you just see the transfer slot appear.
- 31 accelerator squirters front and rear. You may need a 33 up front.
- If you have an AFR gauge get the motor to idle around 12.9 AFR in neutral 1000 rpm engine fully warmed up.
- Disconnect the secondary linkage and drive the car as a 2 barrel. Tune the front of the carb to get crisp throttle response (you may have to change the ignition curve to really dial in)
- Hook up secondary rod and dial in WOT.
