chippy

hello all, i'm new to the forum and i have a major problem with the carb, the bike struggles to get up to 45mph, and if i hit any head wind i have to gear it down to 3rd and it takes forever to get it to any kind of speed, i got the carb cleaned and the shop owner told me the carb is goosed, is there anything i can do to the carb to salvage it, or has anyone got a good one or know where i could get one, thanks pat