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I learn best when it breaks, burns or explodes.
It’s been said here many times that what is perceived as a carburetor issue turns out to be electrical. One of my 1970’s Italian lumps has had an occasional sputter that I notice while cruising along at 30 mph. The bike has new Dellorto carbs and though not perfect the jetting is getting close. I was sorting out a problem ignition switch checking the spark is functioning holding a plug to the head while kicking the bike over and noticed arcing through a high tension boot on a coil, the spark was occasionally taking the path of least resistance jumping to the frame and starving the plug of a spark. The coils hang out front below the gas tank on rubber mounts and when the bike hits a bump the coils jiggle and get close to the frame, spark jumps through a crack in the boot. Had I not had the garage door closed and only a couple lights on I probably would never have noticed this. So I got lucky this time and was able to figure it out. Check those high tension leads and rubber boots!