There is no way this thing will idle in the 600s.
I got the timing light with the advance and the rpms.
I’ve been messing with it for over an hour.
I set the advance at 3, try to dial in the bb, slowly back out the idle screw.
As soon as it gets around low 800s, it dies.
Start it back up and it’s at 1030 or something.
Every time it dies, it changes.
Start all over again.
Play with the mixture screw as I try to adjust the idle and keep it running, check bb, etc etc.
it’s a never ending cycle of frustration.
I don’t know how it would ever get to 600 or even 690 and stay running.