The reason is it isn't completely closed afterall. As mentioned, the disc
may not be centered. But also remember you have to disconnect the linkages
from each other so they may move independently. If the tie linkages are
still connected adjusting one set screw will open both throttles.
But you probably knew that.
Dave
In a message dated 6/4/2013 5:16:21 PM Central Daylight Time,
guy@genfiniti.com writes:
> I am using a Uni-Syn tool to balance the air flow (main idle).
> The weird thing is that I achieve balance with the front carb's screw not
> touching at all (therefore the throttle is not opened at all), and the
> rear
> carb's screw is engaged (thus opening the throttle).
> If this is correct, it means I am getting air flow balance from one carb
> completely closed, and the other partially opened, which should not
> happen.
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