Maybe you have the carb bowls switched. I dont know if that has anything to do with it but worth a try. I remember reading on her that one of the bowls have to go on a certain carb.
I have a 1984 Honda Cb 400 T Hawk supposed to be a collectors bike. . I bought it from a buddy like a year ago. It needs throttle,clutch,choke cable,battery,tires,and air filter. About two hundred in parts. $700