fuel problem

[bout_it_4real]

Not sure if i found the problem. But what does it mean if u start the bike with the air filter off and place your hand over the mouth of the intake portion of a carb and their is only little suction this is what is going on on my #4 carb while the bike is running all the rest 1 thru 3 if i try and do this the bike shuts off while #4 continues to run and only have little suction?

[Red01]

Then I'd say you have a vacuum leak @ #4.  Try spraying starting fluid or WD-40 around the #4 manifold, mount flange, carb clamp, vacuum hose attachments and anywhere else you suspect vacuum might be suffering.  Check the condition of the vacuum hoses and the manifold itself.