79 GL. Yes, I am asking about how to do the procedure. Mostly, how do I draing the float bowls and how do I "tap" them since it seems impossible to get in there with a rubber mallet of even a small size. What have other people done?
I never did the procedure, but I suppose you could remove the float bowl drain screws (the brass one's at the bottom of each bowl) to drain the gas. After re-installing the drain screws it would probably be best to pour the gas/cleaner in via fuel hose closest to the carbs thereby avoiding the fuel pump. I'd use a syringe to do it rather than a small funnel.
I don't know about the tapping, but if you wanted to tap on the bowls a bit you could use a long extension or dowel with a very small hammer.