Hi all, long time.
1980 CB650. Carbs are dialed in right, but I had sudden onset intermittent lurching. I sprayed some lube around the carbs and saw some changes in RPMs, but the smoking gun was leaning in and hearing a hissing noise from the rear of the carbs (as in towards the airbox) when opening the throttle.
Please god, don't make me have to take these carbs off again. Who's got a story of having fixed an air leak without removing the the carbs? I'm beggin ya.