Holley 750 hp vacuum secondary or Holley Double pumper?

Bewy said

Bear in mind that if you richen up the idle [ post #8 ] so that without a choke the carb doesn't 'sneeze' on cold start ups, it will be rich at idle at operating temperature.

Click to expand...

At first read you make it sound like that’s a bad thing or a negative. But you’re right. Considering that we don’t know just how lean his idle circuitry might be, but it is, obviously he needs to go a tad richer to eliminate that, or just ignore it. Just a cold morning issue.

Me? I set my idle circuits for best quality and running, not by trying to achieve any supposed ideal number on a A/F ratio gauge (even though I run one) or plug color. My reading at idle is about 13.5+/- iirc but not because that’s what I want, that’s where it’s at after tweaking for vacuum, idle quality etc.

Had my first real taste of hard cold starting and warm up idle sneezing and buck snorting on an old Triumph Bonneville 750 with Amal’s. Only took slight richening of the air screws to eliminate that malady.