<VV> fuel/air mix theory

[Sethracer@aol.com]

In a message dated 7/27/2004 9:58:30 AM Pacific Standard Time, 
thegeek2@juno.com writes:
Turned the
drivers side carb linkage until the change was about 1.5-2.  The
difference seems to stay the same at speed.  But the engine is running
more smoothly.

Car hot.

In gear:
        no va at idle.
        Tach bounces between 550-625.  I have the gauge connected to
ground and the distributor side of the coil.
        Increase RPM and the va operates.

Did you disconnect the throttle link on the left side carb first? If you are 
adjusting idle SPEED settings, they must be disconnected from each other. 

In this order:
Disconnect throttle link on left side carb throttle arm.
Disconnect and plug vacuum advance hose.
Set idle mixture screws at two turns out from light seating.
Hook-up idle dwell tach (0 to 1000 RPM setting). 
Start car and balance idle speed with idle speed scews on each carb using 
Uni-syn or equal. Should be at an RPM you find comfortable. 
Play with idle mixture screws - 1/8 of a turn at a time - Adjust both mixture 
screws  (left and right) the same amount. Try to get the highest idle speed 
at the original speed screw settings. It will probably be richer - IE the screw 
will be backed out from the initial setting. The highest RPM means the 
mixture is optimal. If the RPM goes too high, you may have to back off the Idle 
speed screws some to bring it down. (Not likely) 
Once you have the idle speed and the mixtures where you want them, adjust the 
left side throttle link to "just" slip into the throttle arm on the carb. 
Check your vacuum advance hose. At this point you should not have any vacuum 
going to the advance. If you do, something else is wrong. If you do not - hook 
the hose back up to the distributor. You're done. - Seth Emerson