This is one of those situations where you can either do the job right the first time or be aggravated for months because you were too lazy to do the job right the first time. Go ahead and pull the carb off the bike, remove all rubber parts, and give it a good dousing with carb cleaner. 99% of the time no actual hard parts are needed--either the float is stuck from varnish build-up, or the needle has trash in it, usually a chunk of varnish broken loose from the petcock bowl. Might as well remove the petcock and give it a good cleaning, too. Replace any rubber parts that are ripped, frayed, or hardened into some odd shape. Carry the old rubber parts to an industrial seal supply and have them match up the original Viton parts with Buna-N parts, which are almost impervious to ethanol. Might as well richen the main jet if you have a U. S. of A. or Canadian to improve throttle response while you are in the carb.