QUOTE(MarkV @ Jun 26 2018, 08:51 PM)
Interesting. Seems like when I tried setting the initial that low I had a problem with an off idle bog. That was using a Bosch 050 distributor. Don't know if I ever tried it with the Mallory. What is the issue with running too much initial advance?
Problem with answering this is I'd have to write a novel
I aim for 8 degrees. 900rpm and the carb idle screws out 1-1/2 turns. This with a warm engine, the linkage/throttle plate stop barely touching the stop screw and one linkage arm disconnected. Likely it will run a bit slow, so turning the linkage/throttle plate stop screw a 1/4 to 1/2 turn gets you to an acceptable idle.
This is the point that you sync your carbs and when you reattach the arm nothing should change. After this a quality linkage, opening at exactly the same rate, is what keeps it in sync.
Then comes jetting, but if your jetting changes you have to start again from step one.
As always when tuning a carbs this is assuming that you engine is in good mechanical condition. Beyond this point there's often an issue with the secondary jetting, dirt in jet/fuel, way too aggressive cam or another mechanical issue.
The idle screws out more than 2 turns and you are running lean at idle. Running more than say 1200 rpm at idle and you are off the idle circuit.
I'm no longer a fan of 009 and 050 dizzy's, they always seem to have or create a flat spot. I run a fairly aggressive WEB 163/86b cam (my favorite big T4 cam, 2270cc+) and have had no issues, other than a slightly lumpy, 900rpm idle using a mallory.