Your carbs are not synchronized. The rear carb is supplying all (or most)
of the air at idle. If you don't have a tool for this, you can remove the
air filters and listen to the hiss at each carb throat, adjust the idle
speed screw until the hiss is the same.
MikeC
>But, the problem is that when I cup my hand over one of
>the carb inlets, there is a difference. Block off the front carb and the
>engine continues along with out problem. As soon as I cover the back carb,
>the engine quickly stalls. So what is the deal here?
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