Back to leaky vac line(s)The rich smell didnt start till after I synced the carbs. And I know all about old school bikes and cars with out injection and convertors. I've always had older bikes and cars. Just havent had one yet that I've had this much trouble tuning. But I have always had a weakness for classics.
Someone balanced the carbs to make it run good with the leaks, you changed it and the problem resurfaced.
Rubber and AGE produces leaks. (pun intended)