Re: Idling Problem While Warming & Carb Leaking

Posted by seestheday on Apr 27, 2013; 2:16am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Idling-Problem-While-Warming-Carb-Leaking-tp4039897p4039902.html

Check for a vacuum leak by spraying a flammable aerosol (unlit propane torch, wd-40, etc) around the carb insulators.  That is a likely source of your vacuum leak.  You should be able to isolate it to at least the left or right side of the bike (carbs 1-2 or 3-4).  Lots of places they could be leaking.  Cracked old insulators are the usual culprit, but it could be leaking via a loose carb sync vacuum sensor screw or even somewhere inside the carb.