So I basically understand how my keihin pwk carb on my Ktm 150sx works but a bit conused on vent hoses?? Recently, the hose coming out of the middle of the carb on the exhaust side flopped off and it appears that gas was coming out of there while I was riding because theres a lot of residue on my tranny. I thought they were for venting air?.. then I start thinking and wouldn't they want to suck air into the engine? Can someone explain the concept behind these hoses please?