vacuum hoses

Hi, New member here. Cleaned and installed the carbs today and of course the left cylinder now isn't running so I just took the off again and didn't see anything obvious that I screwed up. I will give the another go tomorrow. They sure do come off and go back on easy enough. Any thoughts...

Greetings all. 1981 CX500C. There are two small hoses on the vacuum petcock. I understand one is for the vacuum hose routed to the right intake manifold and one is a breather tube that hangs down by the swing arm but... which hose goes to which fitting on the petcock? My idea is the vacuum...